Filtering the results of Vector Search with LangChain

[Prakul_Agarwal]

preFilter configuration and indexing for Langchain retriever

Hi @Adrien_Le_Clair , which version of Langchain JS are you using? In v0.0.165 we released the use of $vectorSearch syntax in Langchain - Release notes , PR If using langchain JS >= v0.0.165 requires two changes to the code you posted: In the Atlas Vector Search index definition use the following { "mappings": { "fields": { "field1": { "type": "token", "normalizer": "lowercase" }, "embedding": [ { "dimensions": 1536, "sim…