---
features:
  - |
    Add memory sharing between different instances of InMemoryDocumentStore.
    Setting the same `index` argument as another instance will make sure that the memory is shared.
    e.g.
    ```python
    index = "my_personal_index"
    document_store_1 = InMemoryDocumentStore(index=index)
    document_store_2 = InMemoryDocumentStore(index=index)

    assert document_store_1.count_documents() == 0
    assert document_store_2.count_documents() == 0

    document_store_1.write_documents([Document(content="Hello world")])

    assert document_store_1.count_documents() == 1
    assert document_store_2.count_documents() == 1
    ```