Why Metadata field NO page number?

Hello,

Thank you for using AWS Bedrock!!

Currently, metadata and filters feature requires that the customer provides an additional file during the ingestion job to be attached to the chunks generated. Official documentation for this feature mentioned this: https://docs.aws.amazon.com/bedrock/latest/userguide/knowledge-base-ds.html#kb-ds-metadata

The use case that you are looking for is not supported currently, due to knowledge bases doesn't extract implicit metadata from the documents processed.