Bedrock Knowledge Base + Pinecone fails after vectors inserted

Support
1

I’m integrating AWS Bedrock Knowledge Bases (VECTOR) with Pinecone Serverless as the vector store. Embeddings are Amazon Titan Text Embeddings v2 (1024 dims, cosine). When my Pinecone index is empty, I can create/connect the KB. As soon as I insert vectors and try to retrieve, Bedrock returns an error — and if I try to re-create the KB pointing to a non-empty index/namespace, I get a storage configuration validation error.

Pinecone index details

  • Type: Serverless (Dense)

  • Cloud/Region: aws / us-west-2

  • Dimensions: 1024

  • Metric: cosine

  • Namespaces tested:

    • "" (empty / default)

    • "vitacasa"

I can upsert and fetch vectors directly via Pinecone HTTP API.

  1. Bedrock retrieve (index has data)
aws bedrock-agent-runtime retrieve \
  --region us-west-2 \
  --knowledge-base-id 123 \
  --retrieval-query '{ "text": "comprar una propiedad en México notario preventa Zapopan" }' \
  --retrieval-configuration '{"vectorSearchConfiguration":{"numberOfResults":5}}'

Returns:

An error occurred (DependencyFailedException) when calling the Retrieve operation: Internal Server Exception
  1. Bedrock create-knowledge-base (pointing to a non-empty index / namespace)
  • If I include "namespace":"vitacasa" (or any non-empty), I get:
ValidationException: The knowledge base storage configuration provided is invalid, please check your configuration.

  • If I omit the namespace (so default/empty), KB creation succeeds only when the index is empty; once the index has data, retrieval later fails with the same DependencyFailedException.

    Questions:

  1. Could Bedrock be calling Pinecone endpoints like /namespaces without the X-Pinecone-API-Version header during validation or retrieval, causing Pinecone to return an error and Bedrock to surface ValidationException / DependencyFailedException?
  2. Are there constraints on metadata that could cause Pinecone to reject/400 something Bedrock sends (e.g., large text metadata, field names like text / url, stringified numbers, etc.)? Any reserved keys?