[BUG] Rebase Main Branch w/ Refactors from upstream core

[nknize]

What is the bug?
Build fails with some latest namespace and library refactoring from core (e.g., opensearch-project/OpenSearch#9005). This was caught by the compatibility checker on opensearch-project/OpenSearch#9073.

How can one reproduce the bug?
Steps to reproduce the behavior:
Build with latest SNAPSHOT version of core

What is the expected behavior?
Passing build. No failures.

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?

/tmp/groovy-generated-tmpdir-8603924191756215072/src/main/java/org/opensearch/search/asynchronous/stats/AsynchronousSearchStats.java:11: error: cannot find symbol

import org.opensearch.common.io.stream.StreamInput;
                                      ^
  symbol:   class StreamInput
  location: package org.opensearch.common.io.stream
/tmp/groovy-generated-tmpdir-8603924191756215072/src/main/java/org/opensearch/search/asynchronous/stats/AsynchronousSearchStats.java:12: error: cannot find symbol
import org.opensearch.common.io.stream.StreamOutput;

Do you have any additional context?
#5910