Mute DeleteExpiredDataIT (elastic#64166)

For elastic#62699
# Conflicts:
#	x-pack/plugin/ml/qa/native-multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/ml/integration/DeleteExpiredDataIT.java

Author: davidkyle

x-pack/plugin/ml/qa/native-multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/ml/integration/DeleteExpiredDataIT.java

@@ -96,10 +96,50 @@ public void testDeleteExpiredData_GivenNothingToDelete() throws Exception {
         client().execute(DeleteExpiredDataAction.INSTANCE, new DeleteExpiredDataAction.Request()).get();
     }
 
+    @AwaitsFix( bugUrl = "https://github.com/elastic/elasticsearch/issues/62699")
     public void testDeleteExpiredDataNoThrottle() throws Exception {
         testExpiredDeletion(null, 10010);
     }
 
+    /**
+     * Verifies empty state indices deletion. Here is the summary of indices used by the test:
+     *
+     * +------------------+--------+----------+-------------------------+
+     * | index name       | empty? | current? | expected to be removed? |
+     * +------------------+--------+----------+-------------------------+
+     * | .ml-state        | yes    | no       | yes                     |
+     * | .ml-state-000001 | no     | no       | no                      |
+     * | .ml-state-000003 | yes    | no       | yes                     |
+     * | .ml-state-000005 | no     | no       | no                      |
+     * | .ml-state-000007 | yes    | yes      | no                      |
+     * +------------------+--------+----------+-------------------------+
+     */
+    public void testDeleteExpiredDataActionDeletesEmptyStateIndices() throws Exception {
+        client().admin().indices().prepareCreate(".ml-state").get();
+        client().admin().indices().prepareCreate(".ml-state-000001").get();
+        client().prepareIndex(".ml-state-000001").setSource("field_1", "value_1").get();
+        client().admin().indices().prepareCreate(".ml-state-000003").get();
+        client().admin().indices().prepareCreate(".ml-state-000005").get();
+        client().prepareIndex(".ml-state-000005").setSource("field_5", "value_5").get();
+        client().admin().indices().prepareCreate(".ml-state-000007").addAlias(new Alias(".ml-state-write").isHidden(true)).get();
+        refresh();
+
+        GetIndexResponse getIndexResponse = client().admin().indices().prepareGetIndex().setIndices(".ml-state*").get();
+        assertThat(Strings.toString(getIndexResponse),
+            getIndexResponse.getIndices(),
+            is(arrayContaining(".ml-state", ".ml-state-000001", ".ml-state-000003", ".ml-state-000005", ".ml-state-000007")));
+
+        client().execute(DeleteExpiredDataAction.INSTANCE, new DeleteExpiredDataAction.Request()).get();
+        refresh();
+
+        getIndexResponse = client().admin().indices().prepareGetIndex().setIndices(".ml-state*").get();
+        assertThat(Strings.toString(getIndexResponse),
+            getIndexResponse.getIndices(),
+            // Only non-empty or current indices should survive deletion process
+            is(arrayContaining(".ml-state-000001", ".ml-state-000005", ".ml-state-000007")));
+    }
+
+    @AwaitsFix( bugUrl = "https://github.com/elastic/elasticsearch/issues/62699")
     public void testDeleteExpiredDataWithStandardThrottle() throws Exception {
         testExpiredDeletion(-1.0f, 100);
     }