[FEATURE] [Documentation Request] Parent-child relationships

[nateynateynate]

Is your feature request related to a problem?

Anecdote in the community meetings as well some github issues,

• https://github.com/opensearch-project/documentation-website/issues/410
• https://github.com/opensearch-project/OpenSearch/issues/2474

there are some barriers to adoption regarding the current state of, and future plan for the use of parent-child document mappings and queries.

I'd love to see some official documentation on this.

What solution would you like?

Whatever current documentation we have regarding index mappings should probably include the related functionality described above.

What alternatives have you considered?

Do you have any additional context?

[Naarcha-AWS]

Hi everyone. Parent/child mappings and the has_child parameter has been documented here: https://opensearch.org/docs/latest/opensearch/supported-field-types/join/