Update or remove ingestion server ES mapping

[AetherUnbound]

Description

Ingestion server Readme has a very old ES mapping schema

Originally reported by @obulat

We could potentially generate this mapping dynamically, or at least point to where it is defined in the code rather than copying the text into the markdown file.

Link: https://github.com/WordPress/openverse-api/blob/b114de9d4bf6ac581c0075fa65877686e5def2ff/ingestion_server/README.md#mapping-database-tables-to-elasticsearch

Implementation

• [ ] 🙋 I would be interested in implementing this feature.

[vaibhavkoshti7]

hi @zackkrida . I would like to work on this issue as my first PR .Can you assign me this.

[krysal]

Hi @vaibhavkoshti7 it's yours!