Register the sort processor factory

Signed-off-by: Daniel Widdis <[email protected]>

modules/search-pipeline-common/src/main/java/org/opensearch/search/pipeline/common/SearchPipelineCommonModulePlugin.java

@@ -96,7 +96,9 @@ public Map<String, Processor.Factory<SearchResponseProcessor>> getResponseProces
                 TruncateHitsResponseProcessor.TYPE,
                 new TruncateHitsResponseProcessor.Factory(),
                 CollapseResponseProcessor.TYPE,
-                new CollapseResponseProcessor.Factory()
+                new CollapseResponseProcessor.Factory(),
+                SortResponseProcessor.TYPE,
+                new SortResponseProcessor.Factory()
             )
         );
     }