Bugs and Missing Features in SEARCH Query Engine

[BagritsevichStepan]

This issue serves as a summary of all reported problems in the Dragonfly SEARCH query engine, consolidating known bugs and missing features that need to be addressed. Below is a list of the key issues.

• Bug in the FT.SEARCH command: for queries like @some_field:{some_value} [KNN search expression]. The search only considers the KNN expression but does not filter documents by the specified some_field value. Estimated time: ~1 day
• Support synonyms in queries. Add FT.SYNADD, FT.SYNUPDATE, FT.SYNDUMP. Estimated time: ~1 day
• Fully support full text search: (Estimated time: ~3 days)
  - Support prefix search. For example: @text:prefix*. Discussion.
  - Support infix queries. For example: @text:*infix*
  - Support suffix queries. For example: @text:*infix
• Test escaping and direct qutoes to be on the safe side. Discussion №1. Discussion №2 . Estimated time: ~2 days