Merge branch '9.0' into mtvconstantbp90

Author: jdconrad

x-pack/plugin/security/src/main/java/module-info.java

@@ -23,7 +23,6 @@
     requires org.apache.httpcomponents.httpclient;
     requires org.apache.httpcomponents.httpasyncclient;
     requires org.apache.httpcomponents.httpcore.nio;
-    requires org.apache.log4j;
     requires org.apache.logging.log4j;
     requires org.apache.logging.log4j.core;
     requires org.apache.lucene.core;