Remove transport-nio plugin

CHANGELOG-3.0.md

@@ -51,6 +51,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Remove custom Map, List and Set collection classes ([#6871](https://github.com/opensearch-project/OpenSearch/pull/6871))
 - Remove `index.store.hybrid.mmap.extensions` setting in favor of `index.store.hybrid.nio.extensions` setting ([#9392](https://github.com/opensearch-project/OpenSearch/pull/9392))
 - Remove package org.opensearch.action.support.master ([#4856](https://github.com/opensearch-project/OpenSearch/issues/4856))
+- Remove transport-nio plugin ([#16887](https://github.com/opensearch-project/OpenSearch/issues/16887))
 
 ### Fixed
 - Fix 'org.apache.hc.core5.http.ParseException: Invalid protocol version' under JDK 16+ ([#4827](https://github.com/opensearch-project/OpenSearch/pull/4827))

gradle/missing-javadoc.gradle

@@ -149,7 +149,6 @@ configure([
   project(":plugins:repository-hdfs"),
   project(":plugins:repository-s3"),
   project(":plugins:store-smb"),
-  project(":plugins:transport-nio"),
   project(":plugins:crypto-kms"),
   project(":qa:die-with-dignity"),
   project(":qa:wildfly"),

plugins/identity-shiro/build.gradle

@@ -31,7 +31,6 @@ dependencies {
   implementation "org.bouncycastle:bcprov-jdk18on:${versions.bouncycastle}"
 
   testImplementation project(path: ':modules:transport-netty4') // for http
-  testImplementation project(path: ':plugins:transport-nio') // for http
   testImplementation "org.mockito:mockito-core:${versions.mockito}"
   testImplementation project(path: ':client:rest-high-level')
   testImplementation 'junit:junit:4.13.2'