fix(bedrock): create index with faiss and l2

[jl4nz]

Fixes #349

New KB bedrock indexes use faiss.

CDK:
KnowledgeBase/KB: Received response status [FAILED] from custom resource. Message returned: Error: An error occurred (ValidationException) when calling the CreateKnowledgeBase operation: The knowledge base storage configuration provided is invalid... The OpenSearch Serverless engine type associated with your vector index is invalid. Recreate your vector index with one of the following valid engine types: FAISS. Then retry your request.

New setup from AWS Console

[jstrunk]

Thank you for catching this and submitting this PR. I confirmed in the Bedrock KB docs that OpenSearch indexes should now be faiss to support the new metadata filtering feature. The l2 space type refers to Euclidean Distance which is the new recommendation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (dafcdc0) to head (d6b2bf5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
+ Coverage   96.13%   96.35%   +0.21%     
==========================================
  Files          40       40              
  Lines        9682     9682              
  Branches      277      279       +2     
==========================================
+ Hits         9308     9329      +21     
+ Misses        374      353      -21     

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[krokoko]

thanks @jl4nz for this contribution ! :)