Field and Document Level Security

In Elasticsearch, you might not want every user to see all data. Sometimes, certain users should only access specific parts of documents or only a subset of documents.

This is where fine-grained security comes in. It allows you to control access at a much more detailed level than just index permissions.

Field Level Security (FLS) lets you restrict which fields within a document a user can see. Imagine a product document with many fields.

• A sales agent might only need to see product_name and price.
• An inventory manager might need quantity and supplier_id.

FLS ensures users only retrieve the fields relevant to their role, hiding sensitive or irrelevant data.