Convert object to invalid port number.

In parseIntFromObjectOrString, if the provided object is null, convert
it to -1, an invalid port number.

Author: mjwolf

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/CommunityIdProcessor.java

@@ -268,7 +268,7 @@ static byte[] toUint16(int num) {
      */
     static int parseIntFromObjectOrString(Object o, String fieldName) {
         if (o == null) {
-            return 0;
+            return -1;
         } else if (o instanceof Number number) {
             return number.intValue();
         } else if (o instanceof String string) {