try using STRING.convert in place of toString in INTEGER and LONG convert

Author: efd6

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

@@ -34,7 +34,7 @@ enum Type {
             @Override
             public Object convert(Object value) {
                 try {
-                    String strValue = value.toString();
+                    String strValue = STRING.convert(value);
                     if (strValue.startsWith("0x") || strValue.startsWith("-0x")) {
                         return Integer.decode(strValue);
                     }
@@ -49,7 +49,7 @@ public Object convert(Object value) {
             @Override
             public Object convert(Object value) {
                 try {
-                    String strValue = value.toString();
+                    String strValue = STRING.convert(value);
                     if (strValue.startsWith("0x") || strValue.startsWith("-0x")) {
                         return Long.decode(strValue);
                     }