Feature/AWS Bedrock Knowledge Bases retriever

[RPKosec]

Changes:

• AWS Bedrock Knowledge bases retriever added
• root package.json updated with @langchain/aws v0.0.6 in overrides

[HenryHengZJ]

looks good! Do you have a screenshot of working flow? I dont have one handy

[RPKosec]

looks good! Do you have a screenshot of working flow? I dont have one handy

Sure, this is screenshot of simple flow using https://www.zamg.ac.at/histalp/download/abstract/Auer-etal-2001b-F.pdf as test document. Filter is set up (second screenshot) according to metadata file:

{
    "metadataAttributes" : { 
        "Source" : "austrian-long-term-climate-1767-2000",
        "yearFrom" :  1767,
        "yearTo" :  2000,
        "topic": "climate"
    }
}

which returns answer to query. If filter is set to something else that does not match the metadata, response states that there is no context for this query. Search type is default if nothing is stated or the selected hybrid/semantic if selected.

[HenryHengZJ]

thanks @RPKosec !