Expand 'metadata index'

Author: DaveCTurner

server/src/main/java/org/elasticsearch/gateway/PersistedClusterStateService.java

@@ -321,7 +321,7 @@ OnDiskState loadOnDiskState(boolean checkClean) throws IOException {
                             if (logger.isErrorEnabled()) {
                                 outputStream.bytes().utf8ToString().lines().forEach(l -> logger.error("checkIndex: {}", l));
                             }
-                            throw new IllegalStateException("metadata index at [" + dataPath +
+                            throw new IllegalStateException("the index containing the cluster metadata under the data path [" + dataPath +
                                 "] has been changed by an external force after it was last written by Elasticsearch and is now unreadable");
                         }
                     }

server/src/test/java/org/elasticsearch/gateway/PersistedClusterStateServiceTests.java

@@ -666,7 +666,7 @@ public void testFailsIfCorrupt() throws IOException {
             }
 
             assertThat(expectThrows(IllegalStateException.class, persistedClusterStateService::loadOnDiskState).getMessage(), allOf(
-                    startsWith("metadata index at ["),
+                    startsWith("the index containing the cluster metadata under the data path ["),
                     endsWith("] has been changed by an external force after it was last written by Elasticsearch and is now unreadable")));
         }
     }