[7.16] Tolerate benign log4j status messages in tests (#81851) (#81875)

Author: ChrisHegarty

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -150,9 +150,13 @@
 
 import static java.util.Collections.emptyMap;
 import static org.elasticsearch.common.util.CollectionUtils.arrayAsArrayList;
+import static org.hamcrest.Matchers.anyOf;
+import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.emptyCollectionOf;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasItem;
+import static org.hamcrest.Matchers.startsWith;
 
 /**
  * Base testcase for randomized unit testing with Elasticsearch
@@ -631,6 +635,15 @@ public void log(StatusData data) {
         });
     }
 
+    // Tolerate the absence or otherwise denial of these specific lookup classes.
+    // At some future time, we should require the JDNI warning.
+    private static final List<String> LOG_4J_MSG_PREFIXES = org.elasticsearch.core.List.of(
+        "JNDI lookup class is not available because this JRE does not support JNDI. "
+            + "JNDI string lookups will not be available, continuing configuration.",
+        "JMX runtime input lookup class is not available because this JRE does not support JMX. "
+            + "JMX lookups will not be available, continuing configuration. "
+    );
+
     // separate method so that this can be checked again after suite scoped cluster is shut down
     protected static void checkStaticState() throws Exception {
         LeakTracker.INSTANCE.reportLeak();
@@ -644,7 +657,11 @@ protected static void checkStaticState() throws Exception {
                 // StatusData instances to Strings as otherwise their toString output is useless
                 assertThat(
                     statusData.stream().map(status -> status.getMessage().getFormattedMessage()).collect(Collectors.toList()),
-                    empty()
+                    anyOf(
+                        emptyCollectionOf(String.class),
+                        contains(startsWith(LOG_4J_MSG_PREFIXES.get(0)), startsWith(LOG_4J_MSG_PREFIXES.get(1))),
+                        contains(startsWith(LOG_4J_MSG_PREFIXES.get(1)))
+                    )
                 );
             } finally {
                 // we clear the list so that status data from other tests do not interfere with tests within the same JVM