Update unit test after removing _all
Original commit: elastic/x-pack-elasticsearch@59c80a6ba3d16e1266102f7471d36a0390ada6db
@@ -67,7 +67,6 @@ public class ElasticsearchMappingsTests extends ESTestCase {
// These are not reserved because they're Elasticsearch keywords, not
// field names
- overridden.add(ElasticsearchMappings.ALL);
overridden.add(ElasticsearchMappings.ANALYZER);
overridden.add(ElasticsearchMappings.COPY_TO);
overridden.add(ElasticsearchMappings.DYNAMIC);
