Enhance jsonparser logging with content of the unexpected token. This…

… would

greatly help tracing to the root of error in case istio proxy return unexpected
error messages during meeting connection issues.

server/src/main/java/org/apache/druid/client/JsonParserIterator.java

@@ -185,6 +185,12 @@ private void init()
         } else if (nextToken == JsonToken.START_OBJECT) {
           throw convertException(jp.getCodec().readValue(jp, QueryException.class));
         } else {
+          if (nextToken == JsonToken.VALUE_STRING) {
+            LOG.error(
+                "Next Token value is of type VALUE_STRING with content [%s], not as expected START_ARRAY",
+                jp.getText()
+            );
+          }
           throw convertException(
               new IAE("Next token wasn't a START_ARRAY, was[%s] from url[%s]", jp.getCurrentToken(), url)
           );