Remote reindex ElasticSearch API giving Null Pointer Exception

Remote reindex Elasticsearch API giving Null Pointer Exception

GET ..../tasks/{taskid}

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"error" : {
    "type" : "null_pointer_exception",
    "reason" : null
  }

Can someone know what could be the cause of the exception??

This is a similar discussion with the one in Connection timed out when remote cluster re-indexing - #9 by Prashant_Kamble

Please keep the discussion in a single place.
Thanks

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