Context

The primary VectorStore MongoDBAtlasVectorSearch looks for and automatically creates a vector search index. By extension, so does the VectorSearch*Retriever* via the .as_retriever method. The FullText and Hybrid SearchRetrievers, however, require one to manually set up the full text search index.

This may matter more now that we've introduced the $rankFusion operator.

Acceptance Criteria

• Review all the retrievers in the retriever subpackage
  • FullTextSearchRetriever
  • HybridSearchRetriever
  • ParentDocumentRetriever
• Integrate a function in the {}init{} kwargs to automatically generate a search index.
• Leverage `pymongo-search-utils` function.

Pitfalls

• Be on the lookout for AutoEmbedding as this will affect the overall design.