[FEATURE] Data Stream Api

[gkozyryatskyy]

Is your feature request related to a problem?

There is data stream functionality of Open Search https://opensearch.org/docs/latest/im-plugin/data-streams/. This functionality cant be used with Open Search Java client.

What solution would you like?

1. Add data stream api support to Open Search Java client. Something like:

• client.indices().getDataStream()
• client.indices().putDataStream()
• client.indices().deleteDataStream()

2. Add an ability to override timestamp_field for dataStream at putIndexTemplate

What alternatives have you considered?

Writing my own implementation using org.opensearch.client.RestClient

[VachaShah]

Thank you @gkozyryatskyy for the feature request. Would you be willing to open a PR for the feature?

[gkozyryatskyy]

@VachaShah not for now, but may be in the future if it is not in your plans.

Thank you for the reply!

[tanqiuliu]

I have created a PR #416 for data stream APIs, which covers the feature you mentioned.