Revert "SOLR-11904: Mark ReplicationHandler's polling thread as a Sol…

…r server thread so the PKI Interceptor is activated to allow PULL replicas to replicate from security-enabled leaders (apache#110)"

To address review comments after merge.

This reverts commit d316946.

solr/CHANGES.txt

@@ -373,9 +373,6 @@ Bug Fixes
 
 * SOLR-15383: Solr Zookeeper status page shows green even when some Zookeepers are not serving requests (janhoy)
 
-* SOLR-11904: Mark ReplicationHandler's polling thread as a Solr server thread so the PKI Interceptor is activated to
-  allow PULL replicas to replicate from security-enabled leaders (Timothy Potter)
-
 Other Changes
 ---------------------
 * SOLR-15118: Deprecate CollectionAdminRequest.getV2Request(). (Jason Gerlowski)

solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java

@@ -1208,7 +1208,6 @@ private void setupPolling(String intervalStr) {
         log.info("Poll disabled");
         return;
       }
-      ExecutorUtil.setServerThreadFlag(true); // so PKI auth works
       try {
         log.debug("Polling for index modifications");
         markScheduledExecutionStart();