How do you add new metadata keys and values in the 'metadata' column of a Vector Store

[iAMSagar44]

trafficstars

Discussed in https://github.com/spring-projects/spring-ai/discussions/501

^{Originally posted by iAMSagar44 March 24, 2024} Currently the DocumentReader interface implementations (e.g.PagePdfDocumentReader) add the page number and file name to the metadata map. This eventually populates the 'metadata' column with the page number and file name. I want to add more metadata information (for e.g. author) during the ETL process, so that I can then use these fields as metadata fields in the similarity search filters. I could not find any way to do this, apart from creating my own implementation of the DocumentReader interface.

Is there any other way to cater for this use case?