fix metadata filtering

[acatav]

Problem

KB use metadata_filter instead of filter param in query to Pinecone, so metadata filtering not working

Solution

Use the correct param name

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Added a new test for metadata filtering

[igiloh-pinecone]

Good catch!!

LGTM