[BUG] Inconsistent priority field type between PutIndexTemplateRequest and IndexTemplate models

[houssain-barouni]

Hi,

I have observed a type inconsistency in the Java client related to the priority field when working with index templates. I am using the 2.9.0 client version, and I see the issue is still present in the latest version.

Details:

• PutIndexTemplateRequest (org.opensearch.client.opensearch.indices.PutIndexTemplateRequest): the priority field is of type Integer
• IndexTemplate (org.opensearch.client.opensearch.indices.get_index_template.IndexTemplate): The priority field is of type Long

Issue:

OpenSearch itself supports a 64-bit integer (int64) for the index template priority, but the Java client's PutIndexTemplateRequest only allows an Integer. This mismatch does not allow creating index templates with values above Integer.MAX_VALUE using the Java client.

Expected Behavior:
Both PutIndexTemplateRequest and IndexTemplate should use Long for the priority field to align with OpenSearch's API.

Thanks!