[BUG] RestClientTransport throws NoSuchMethodError

[andrewparmet]

What is the bug?

RestClientTransport is unusable:

java.lang.NoSuchMethodError: 'void org.opensearch.client.Request.setEntity(org.apache.hc.core5.http.HttpEntity)'
  at org.opensearch.client.transport.rest_client.RestClientTransport.prepareLowLevelRequest(RestClientTransport.java:221)
  at org.opensearch.client.transport.rest_client.RestClientTransport.performRequest(RestClientTransport.java:148)
  at org.opensearch.client.opensearch.indices.OpenSearchIndicesClient.create(OpenSearchIndicesClient.java:244)
  at org.opensearch.client.opensearch.indices.OpenSearchIndicesClient.create(OpenSearchIndicesClient.java:258)

Using latest HEAD - d09bb4e.

How can one reproduce the bug?

Use the RestClientTransport.

What is the expected behavior?

Requests should work.

What is your host/environment?

Mac OS.

Do you have any screenshots?

Nope.

Do you have any additional context?

Nope.

[reta]

Please check https://github.com/opensearch-project/opensearch-java/blob/main/USER_GUIDE.md#creating-a-client, the RestClientTransport is deprecated in 3.0.0.