* reorganize docstore test suite to isolate dataframe tests
* improve docstring
* include FilterDocumentsTestWithDataframe in InMemoryDocumentStore tests
* Remove all references to old filter syntax
* More removals
* Lint
* Do not remove test_filter_retriever.py
* Add reno note
* Update ValueError text to match text in haystack-core-integrations
* incorporating better bm25 impl without breaking interface
* all three bm25 algos
* 1. setting algo post-init not allowed; 2. remove extra underscore for naming consistency; 3. remove unused import
* 1. rename attribute name for IDF computation 2. organize document statistics as a dataclass instead of tuple to improve readability
* fix score type initialization (int -> float) to pass mypy check
* release note included
* fixing linting issues and mypy
* fixing tests
* removing heapq import and cleaning up logging
* changing indexing order
* adding more tests
* increasing tests
* removing rank_bm25 from pyproject.toml
---------
Co-authored-by: David S. Batista <dsbatista@gmail.com>
* fix!: `InMemoryBM25Retriever` no longer returns documents that have a score of 0.0
Also update tests to accommodate the new behavior.
* Remove superfluous code
