SOLR-14114: Add WARN to Solr log that embedded ZK is not supported in production (#1273)

solr/CHANGES.txt

@@ -98,6 +98,8 @@ Improvements
 
 * SOLR-14270: export command to have an option to write to a zip file (noble)
 
+* SOLR-14114: Add WARN to Solr log that embedded ZK is not supported in production (janhoy)
+
 Optimizations
 ---------------------
 

solr/core/src/java/org/apache/solr/cloud/SolrZkServer.java

@@ -134,6 +134,8 @@ public class SolrZkServer {
       log.info("STARTING EMBEDDED STANDALONE ZOOKEEPER SERVER at port " + zkProps.getClientPortAddress().getPort());
     }
 
+    log.warn("Embedded Zookeeper is not recommended in production environments. See Reference Guide for details.");
+
     zkThread.setDaemon(true);
     zkThread.start();
     try {