[TEST] Remove "compressed" field data from numeric formats

The "compressed" format was removed, so this caused warnings in the log
like:

```
[WARN ][index.fielddata          ] [node_0] [test] failed to find format
[compressed] for field [test-num], will use default
```

src/test/java/org/elasticsearch/test/ElasticsearchIntegrationTest.java

@@ -1709,11 +1709,10 @@ public abstract class ElasticsearchIntegrationTest extends ElasticsearchTestCase
     }
 
     /**
-     * Returns a random numeric field data format from the choices of "array",
-     * "compressed", or "doc_values".
+     * Returns a random numeric field data format from the choices of "array" or "doc_values".
      */
     public static String randomNumericFieldDataFormat() {
-        return randomFrom(Arrays.asList("array", "compressed", "doc_values"));
+        return randomFrom(Arrays.asList("array", "doc_values"));
     }
 
     /**