diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d87fb7a22..a0ecf8d95 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1231,7 +1231,7 @@ jobs:
 
     - name: Run Elasticsearch
       run: |
-        docker run -d -p 9200:9200 -e "discovery.type=single-node" -e "ES_JAVA_OPTS=-Xms128m -Xmx256m" elasticsearch:7.9.2
+        docker run -d -p 9200:9200 -e "discovery.type=single-node" -e "ES_JAVA_OPTS=-Xms128m -Xmx256m" elasticsearch:7.17.6
 
     - name: Run Opensearch
       run: |
diff --git a/haystack/document_stores/elasticsearch.py b/haystack/document_stores/elasticsearch.py
index c28303f43..3d453d41a 100644
--- a/haystack/document_stores/elasticsearch.py
+++ b/haystack/document_stores/elasticsearch.py
@@ -373,7 +373,7 @@ class ElasticsearchDocumentStore(SearchEngineDocumentStore):
         )
 
         try:
-            result = self.client.search(index=index, body=body, request_timeout=300, headers=headers)["hits"]["hits"]
+            result = self.client.search(index=index, **body, request_timeout=300, headers=headers)["hits"]["hits"]
             if len(result) == 0:
                 count_documents = self.get_document_count(index=index, headers=headers)
                 if count_documents == 0:
@@ -454,7 +454,7 @@ class ElasticsearchDocumentStore(SearchEngineDocumentStore):
                 }
 
         try:
-            self.client.indices.create(index=index_name, body=mapping, headers=headers)
+            self.client.indices.create(index=index_name, **mapping, headers=headers)
         except self._RequestError as e:
             # With multiple workers we need to avoid race conditions, where:
             # - there's no index in the beginning
@@ -483,7 +483,7 @@ class ElasticsearchDocumentStore(SearchEngineDocumentStore):
             }
         }
         try:
-            self.client.indices.create(index=index_name, body=mapping, headers=headers)
+            self.client.indices.create(index=index_name, **mapping, headers=headers)
         except self._RequestError as e:
             # With multiple workers we need to avoid race conditions, where:
             # - there's no index in the beginning
@@ -496,7 +496,7 @@ class ElasticsearchDocumentStore(SearchEngineDocumentStore):
         """
         Validates an existing document index. If there's no embedding field, we'll add it.
         """
-        indices = self.client.indices.get(index_name, headers=headers)
+        indices = self.client.indices.get(index=index_name, headers=headers)
 
         if not any(indices):
             logger.warning(
diff --git a/haystack/document_stores/opensearch.py b/haystack/document_stores/opensearch.py
index 6aba309ad..38e2fb9de 100644
--- a/haystack/document_stores/opensearch.py
+++ b/haystack/document_stores/opensearch.py
@@ -1339,3 +1339,123 @@ class OpenSearchDocumentStore(SearchEngineDocumentStore):
                     progress_bar.update(batch_size)
         finally:
             opensearch_logger.setLevel(original_log_level)
+
+    def get_metadata_values_by_key(
+        self,
+        key: str,
+        query: Optional[str] = None,
+        filters: Optional[FilterType] = None,
+        index: Optional[str] = None,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> List[dict]:
+        """
+        Get values associated with a metadata key. The output is in the format:
+            [{"value": "my-value-1", "count": 23}, {"value": "my-value-2", "count": 12}, ... ]
+
+        :param key: The meta key name to get the values for.
+        :param query: Narrow down the scope to documents matching the query string.
+        :param filters: Narrow down the scope to documents matching the given filters.
+                        Filters are defined as nested dictionaries. The keys of the dictionaries can be a logical
+                        operator (`"$and"`, `"$or"`, `"$not"`), a comparison operator (`"$eq"`, `"$in"`, `"$gt"`,
+                        `"$gte"`, `"$lt"`, `"$lte"`) or a metadata field name.
+                        Logical operator keys take a dictionary of metadata field names and/or logical operators as
+                        value. Metadata field names take a dictionary of comparison operators as value. Comparison
+                        operator keys take a single value or (in case of `"$in"`) a list of values as value.
+                        If no logical operator is provided, `"$and"` is used as default operation. If no comparison
+                        operator is provided, `"$eq"` (or `"$in"` if the comparison value is a list) is used as default
+                        operation.
+
+                            __Example__:
+
+                            ```python
+                            filters = {
+                                "$and": {
+                                    "type": {"$eq": "article"},
+                                    "date": {"$gte": "2015-01-01", "$lt": "2021-01-01"},
+                                    "rating": {"$gte": 3},
+                                    "$or": {
+                                        "genre": {"$in": ["economy", "politics"]},
+                                        "publisher": {"$eq": "nytimes"}
+                                    }
+                                }
+                            }
+                            ```
+        :param index: The search index to search for the meta values. If not supplied,
+                      self.index is used.
+        :param headers: Custom HTTP headers to pass to the client (for example, {'Authorization': 'Basic YWRtaW46cm9vdA=='})
+                Check out [Elasticsearch documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/http-clients.html) for more information.
+        """
+        body: dict = {
+            "size": 0,
+            "aggs": {"metadata_agg": {"composite": {"sources": [{key: {"terms": {"field": key}}}]}}},
+        }
+        if query:
+            body["query"] = {
+                "bool": {
+                    "should": [{"multi_match": {"query": query, "type": "most_fields", "fields": self.search_fields}}]
+                }
+            }
+        if filters:
+            if not body.get("query"):
+                body["query"] = {"bool": {}}
+            body["query"]["bool"].update({"filter": LogicalFilterClause.parse(filters).convert_to_elasticsearch()})
+        result = self.client.search(body=body, index=index, headers=headers)
+
+        values = []
+        current_buckets = result["aggregations"]["metadata_agg"]["buckets"]
+        after_key = result["aggregations"]["metadata_agg"].get("after_key", False)
+        for bucket in current_buckets:
+            values.append({"value": bucket["key"][key], "count": bucket["doc_count"]})
+
+        # Only 10 results get returned at a time, so apply pagination
+        while after_key:
+            body["aggs"]["metadata_agg"]["composite"]["after"] = after_key
+            result = self.client.search(body=body, index=index, headers=headers)
+            current_buckets = result["aggregations"]["metadata_agg"]["buckets"]
+            after_key = result["aggregations"]["metadata_agg"].get("after_key", False)
+            for bucket in current_buckets:
+                values.append({"value": bucket["key"][key], "count": bucket["doc_count"]})
+
+        return values
+
+    def get_documents_by_id(
+        self,
+        ids: List[str],
+        index: Optional[str] = None,
+        batch_size: int = 10_000,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> List[Document]:
+        """
+        Fetch documents by specifying a list of text ID strings.
+
+        :param ids: List of document IDs. Be aware that passing a large number of IDs might lead to performance issues.
+        :param index: The search index where the documents are stored. If not supplied,
+                      self.index is used.
+        :param batch_size: Maximum number of results for each query.
+                           Limited to 10,000 documents by default.
+                           To reduce the pressure on the cluster, you can lower this limit at the expense
+                           of longer retrieval times.
+        :param headers: Custom HTTP headers to pass to the client (for example, {'Authorization': 'Basic YWRtaW46cm9vdA=='})
+                        Check out [Elasticsearch documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/http-clients.html) for more information.
+        """
+        index = index or self.index
+        documents = []
+        for i in range(0, len(ids), batch_size):
+            ids_for_batch = ids[i : i + batch_size]
+            query = {"size": len(ids_for_batch), "query": {"ids": {"values": ids_for_batch}}}
+            if not self.return_embedding and self.embedding_field:
+                query["_source"] = {"excludes": [self.embedding_field]}
+            result = self.client.search(index=index, body=query, headers=headers)["hits"]["hits"]
+            documents.extend([self._convert_es_hit_to_document(hit) for hit in result])
+        return documents
+
+    def update_document_meta(
+        self, id: str, meta: Dict[str, str], index: Optional[str] = None, headers: Optional[Dict[str, str]] = None
+    ):
+        """
+        Update the metadata dictionary of a document by specifying its ID string.
+        """
+        if not index:
+            index = self.index
+        body = {"doc": meta}
+        self.client.update(index=index, id=id, body=body, refresh=self.refresh_type, headers=headers)
diff --git a/haystack/document_stores/search_engine.py b/haystack/document_stores/search_engine.py
index 206d87c13..d4acf0507 100644
--- a/haystack/document_stores/search_engine.py
+++ b/haystack/document_stores/search_engine.py
@@ -166,7 +166,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
             if self.client.indices.exists_alias(name=index_name):
                 logger.debug("Index name %s is an alias.", index_name)
 
-        return self.client.indices.exists(index_name, headers=headers)
+        return self.client.indices.exists(index=index_name, headers=headers)
 
     @abstractmethod
     def _validate_and_adjust_document_index(self, index_name: str, headers: Optional[Dict[str, str]] = None):
@@ -281,7 +281,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
             query = {"size": len(ids_for_batch), "query": {"ids": {"values": ids_for_batch}}}
             if not self.return_embedding and self.embedding_field:
                 query["_source"] = {"excludes": [self.embedding_field]}
-            result = self.client.search(index=index, body=query, headers=headers)["hits"]["hits"]
+            result = self.client.search(index=index, **query, headers=headers)["hits"]["hits"]
             documents.extend([self._convert_es_hit_to_document(hit) for hit in result])
         return documents
 
@@ -344,7 +344,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
             if not body.get("query"):
                 body["query"] = {"bool": {}}
             body["query"]["bool"].update({"filter": LogicalFilterClause.parse(filters).convert_to_elasticsearch()})
-        result = self.client.search(body=body, index=index, headers=headers)
+        result = self.client.search(**body, index=index, headers=headers)
 
         values = []
         current_buckets = result["aggregations"]["metadata_agg"]["buckets"]
@@ -355,7 +355,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
         # Only 10 results get returned at a time, so apply pagination
         while after_key:
             body["aggs"]["metadata_agg"]["composite"]["after"] = after_key
-            result = self.client.search(body=body, index=index, headers=headers)
+            result = self.client.search(**body, index=index, headers=headers)
             current_buckets = result["aggregations"]["metadata_agg"]["buckets"]
             after_key = result["aggregations"]["metadata_agg"].get("after_key", False)
             for bucket in current_buckets:
@@ -521,7 +521,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
         if not index:
             index = self.index
         body = {"doc": meta}
-        self.client.update(index=index, id=id, body=body, refresh=self.refresh_type, headers=headers)
+        self.client.update(index=index, id=id, **body, refresh=self.refresh_type, headers=headers)
 
     def get_document_count(
         self,
@@ -908,7 +908,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
             all_terms_must_match=all_terms_must_match,
         )
 
-        result = self.client.search(index=index, body=body, headers=headers)["hits"]["hits"]
+        result = self.client.search(index=index, **body, headers=headers)["hits"]["hits"]
 
         documents = [self._convert_es_hit_to_document(hit, scale_score=scale_score) for hit in result]
         return documents
@@ -1542,7 +1542,7 @@ class SearchEngineDocumentStore(KeywordDocumentStore):
         self.client.delete_by_query(index=index, body=query, ignore=[404], headers=headers)
         # We want to be sure that all docs are deleted before continuing (delete_by_query doesn't support wait_for)
         if self.refresh_type == "wait_for":
-            time.sleep(2)
+            self.client.indices.refresh(index=index)
 
     def delete_labels(
         self,
diff --git a/pyproject.toml b/pyproject.toml
index c38a17471..a7fef6b38 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,7 +75,7 @@ dependencies = [
   "sentence-transformers>=2.2.0",
 
   # Elasticsearch
-  "elasticsearch>=7.7,<8",
+  "elasticsearch>=7.17,<8",
 
   # OpenAI tokenizer
   "tiktoken>=0.3.0; python_version >= '3.8' and (platform_machine == 'AMD64' or platform_machine == 'amd64' or platform_machine == 'x86_64' or (platform_machine == 'arm64' and platform_system == 'Darwin'))",
diff --git a/test/document_stores/test_elasticsearch.py b/test/document_stores/test_elasticsearch.py
index 09cc89c29..2398d4758 100644
--- a/test/document_stores/test_elasticsearch.py
+++ b/test/document_stores/test_elasticsearch.py
@@ -22,7 +22,8 @@ class TestElasticsearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngine
     @pytest.fixture
     def ds(self):
         """
-        This fixture provides a working document store and takes care of removing the indices when done
+        This fixture provides a working document store and takes care of keeping clean
+        the ES cluster used in the tests.
         """
         labels_index_name = f"{self.index_name}_labels"
         ds = ElasticsearchDocumentStore(
@@ -30,10 +31,10 @@ class TestElasticsearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngine
             label_index=labels_index_name,
             host=os.environ.get("ELASTICSEARCH_HOST", "localhost"),
             create_index=True,
+            recreate_index=True,
         )
+
         yield ds
-        ds.delete_index(self.index_name)
-        ds.delete_index(labels_index_name)
 
     @pytest.fixture
     def mocked_elastic_search_init(self, monkeypatch):
@@ -213,8 +214,8 @@ class TestElasticsearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngine
 
         settings = {"mappings": {"properties": {"content": {"type": "text"}}}}
 
-        client.indices.create(index="haystack_existing_alias_1", body=settings)
-        client.indices.create(index="haystack_existing_alias_2", body=settings)
+        client.indices.create(index="haystack_existing_alias_1", **settings)
+        client.indices.create(index="haystack_existing_alias_2", **settings)
 
         client.indices.put_alias(
             index="haystack_existing_alias_1,haystack_existing_alias_2", name="haystack_existing_alias"
@@ -233,8 +234,8 @@ class TestElasticsearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngine
         right_settings = {"mappings": {"properties": {"content": {"type": "text"}}}}
         wrong_settings = {"mappings": {"properties": {"content": {"type": "histogram"}}}}
 
-        client.indices.create(index="haystack_existing_alias_1", body=right_settings)
-        client.indices.create(index="haystack_existing_alias_2", body=wrong_settings)
+        client.indices.create(index="haystack_existing_alias_1", **right_settings)
+        client.indices.create(index="haystack_existing_alias_2", **wrong_settings)
         client.indices.put_alias(
             index="haystack_existing_alias_1,haystack_existing_alias_2", name="haystack_existing_alias"
         )
@@ -326,3 +327,20 @@ class TestElasticsearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngine
                 username="", aws4auth="foo", **_init_client_remaining_kwargs
             )
         assert len(caplog.records) == 0
+
+    @pytest.mark.unit
+    def test_get_document_by_id_return_embedding_false(self, mocked_document_store):
+        mocked_document_store.return_embedding = False
+        mocked_document_store.get_document_by_id("123")
+        # assert the resulting body is consistent with the `excluded_meta_data` value
+        _, kwargs = mocked_document_store.client.search.call_args
+        assert kwargs["_source"] == {"excludes": ["embedding"]}
+
+    @pytest.mark.unit
+    def test_get_document_by_id_excluded_meta_data_has_no_influence(self, mocked_document_store):
+        mocked_document_store.excluded_meta_data = ["foo"]
+        mocked_document_store.return_embedding = False
+        mocked_document_store.get_document_by_id("123")
+        # assert the resulting body is not affected by the `excluded_meta_data` value
+        _, kwargs = mocked_document_store.client.search.call_args
+        assert kwargs["_source"] == {"excludes": ["embedding"]}
diff --git a/test/document_stores/test_opensearch.py b/test/document_stores/test_opensearch.py
index a06332134..df070bc84 100644
--- a/test/document_stores/test_opensearch.py
+++ b/test/document_stores/test_opensearch.py
@@ -32,7 +32,8 @@ class TestOpenSearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngineDoc
     @pytest.fixture
     def ds(self):
         """
-        This fixture provides a working document store and takes care of removing the indices when done
+        This fixture provides a working document store and takes care of keeping clean the
+        OS cluster used in the tests.
         """
         labels_index_name = f"{self.index_name}_labels"
         ds = OpenSearchDocumentStore(
@@ -40,10 +41,10 @@ class TestOpenSearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngineDoc
             label_index=labels_index_name,
             host=os.environ.get("OPENSEARCH_HOST", "localhost"),
             create_index=True,
+            recreate_index=True,
         )
+
         yield ds
-        ds.delete_index(self.index_name)
-        ds.delete_index(labels_index_name)
 
     @pytest.fixture
     def mocked_document_store(self, existing_index):
@@ -1239,3 +1240,20 @@ class TestOpenSearchDocumentStore(DocumentStoreBaseTestAbstract, SearchEngineDoc
             ]
             mocked_document_store._bulk(documents=docs_to_write, _timeout=0, _remaining_tries=3)
             assert mocked_bulk.call_count == 5
+
+    @pytest.mark.unit
+    def test_get_document_by_id_return_embedding_false(self, mocked_document_store):
+        mocked_document_store.return_embedding = False
+        mocked_document_store.get_document_by_id("123")
+        # assert the resulting body is consistent with the `excluded_meta_data` value
+        _, kwargs = mocked_document_store.client.search.call_args
+        assert kwargs["body"]["_source"] == {"excludes": ["embedding"]}
+
+    @pytest.mark.unit
+    def test_get_document_by_id_excluded_meta_data_has_no_influence(self, mocked_document_store):
+        mocked_document_store.excluded_meta_data = ["foo"]
+        mocked_document_store.return_embedding = False
+        mocked_document_store.get_document_by_id("123")
+        # assert the resulting body is not affected by the `excluded_meta_data` value
+        _, kwargs = mocked_document_store.client.search.call_args
+        assert kwargs["body"]["_source"] == {"excludes": ["embedding"]}
diff --git a/test/document_stores/test_search_engine.py b/test/document_stores/test_search_engine.py
index db8d9b7c9..e83adad24 100644
--- a/test/document_stores/test_search_engine.py
+++ b/test/document_stores/test_search_engine.py
@@ -62,7 +62,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.query(self.query)
         # assert the resulting body is consistent with the `excluded_meta_data` value
         _, kwargs = mocked_document_store.client.search.call_args
-        assert "_source" not in kwargs["body"]
+        assert "_source" not in kwargs
 
     @pytest.mark.unit
     def test_query_return_embedding_false(self, mocked_document_store):
@@ -70,7 +70,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.query(self.query)
         # assert the resulting body is consistent with the `excluded_meta_data` value
         _, kwargs = mocked_document_store.client.search.call_args
-        assert kwargs["body"]["_source"] == {"excludes": ["embedding"]}
+        assert kwargs["_source"] == {"excludes": ["embedding"]}
 
     @pytest.mark.unit
     def test_query_excluded_meta_data_return_embedding_true(self, mocked_document_store):
@@ -79,7 +79,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.query(self.query)
         _, kwargs = mocked_document_store.client.search.call_args
         # we expect "embedding" was removed from the final query
-        assert kwargs["body"]["_source"] == {"excludes": ["foo"]}
+        assert kwargs["_source"] == {"excludes": ["foo"]}
 
     @pytest.mark.unit
     def test_query_excluded_meta_data_return_embedding_false(self, mocked_document_store):
@@ -88,7 +88,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.query(self.query)
         # assert the resulting body is consistent with the `excluded_meta_data` value
         _, kwargs = mocked_document_store.client.search.call_args
-        assert kwargs["body"]["_source"] == {"excludes": ["foo", "embedding"]}
+        assert kwargs["_source"] == {"excludes": ["foo", "embedding"]}
 
     @pytest.mark.unit
     def test_get_all_documents_return_embedding_true(self, mocked_document_store):
@@ -97,10 +97,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.get_all_documents(return_embedding=True)
         # assert the resulting body is consistent with the `excluded_meta_data` value
         _, kwargs = mocked_document_store.client.search.call_args
-        # starting with elasticsearch client 7.16, scan() uses the query parameter instead of body,
-        # see https://github.com/elastic/elasticsearch-py/commit/889edc9ad6d728b79fadf790238b79f36449d2e2
-        body = kwargs.get("body", kwargs)
-        assert "_source" not in body
+        assert "_source" not in kwargs
 
     @pytest.mark.unit
     def test_get_all_documents_return_embedding_false(self, mocked_document_store):
@@ -132,24 +129,7 @@ class SearchEngineDocumentStoreTestAbstract:
         mocked_document_store.get_document_by_id("123")
         # assert the resulting body is consistent with the `excluded_meta_data` value
         _, kwargs = mocked_document_store.client.search.call_args
-        assert "_source" not in kwargs["body"]
-
-    @pytest.mark.unit
-    def test_get_document_by_id_return_embedding_false(self, mocked_document_store):
-        mocked_document_store.return_embedding = False
-        mocked_document_store.get_document_by_id("123")
-        # assert the resulting body is consistent with the `excluded_meta_data` value
-        _, kwargs = mocked_document_store.client.search.call_args
-        assert kwargs["body"]["_source"] == {"excludes": ["embedding"]}
-
-    @pytest.mark.unit
-    def test_get_document_by_id_excluded_meta_data_has_no_influence(self, mocked_document_store):
-        mocked_document_store.excluded_meta_data = ["foo"]
-        mocked_document_store.return_embedding = False
-        mocked_document_store.get_document_by_id("123")
-        # assert the resulting body is not affected by the `excluded_meta_data` value
-        _, kwargs = mocked_document_store.client.search.call_args
-        assert kwargs["body"]["_source"] == {"excludes": ["embedding"]}
+        assert "_source" not in kwargs
 
     @pytest.mark.unit
     def test_get_all_labels_legacy_document_id(self, mocked_document_store, mocked_get_all_documents_in_index):