* very first draft
* implement query and query_batch
* add more bm25 parameters
* add rank_bm25 dependency
* fix mypy
* remove tokenizer callable parameter
* remove unused import
* only json serializable attributes
* try to fix: pylint too-many-public-methods / R0904
* bm25 attribute always present
* convert errors into warnings to make the tutorial 1 work
* add docstrings; tests
* try to make tests run
* better docstrings; revert not running tests
* some suggestions from review
* rename elasticsearch retriever as bm25 in tests; try to test memory_bm25
* exclude tests with filters
* change elasticsearch to bm25 retriever in test_summarizer
* add tests
* try to improve tests
* better type hint
* adapt test_table_text_retriever_embedding
* handle non-textual docs
* query only textual documents
* Adding filters param to MostSimilarDocumentsPipeline run and run_batch
* Adding index param to MostSimilarDocumentsPipeline run and run_batch
* Adding index param documentation to MostSimilarDocumentsPipeline run and run_batch
* Updated index param documentation to MostSimilarDocumentsPipeline run and run_batch. Updated type: ignore in run_batch
* Adding filters param to MostSimilarDocumentsPipeline run and run_batch
* Adding index param to MostSimilarDocumentsPipeline run and run_batch
* Adding index param documentation to MostSimilarDocumentsPipeline run and run_batch
* Updated index param documentation to MostSimilarDocumentsPipeline run and run_batch. Updated type: ignore in run_batch
