ElasticSearch Sink with Structured Streaming

Hi,

I am using this MR https://github.com/elastic/elasticsearch-hadoop/pull/1498 for ElasticSearch sink with Structured Streaming but in that i am having issue in seeing some metrics like "numOutputRows" which always shows -1 instead of some values. Like for Kafka Sink it shows either 0 or some values but with ElasticSearch sink it shows -1 only