What do you want to do?

• [ x] Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request and all versions that are affected.
Update the following page: https://opensearch.org/docs/latest/opensearch/index-templates/ with

GET /_template/<name>
HEAD /_template/<name>
PUT /_template/<name>
POST /_template/<name>
DELETE /_template/<name>

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.