While doing REINDEX API we are getting Runtime Exception

Hi Team,

we are getting runtime Exception in Elasticsearch while using REINDEX API

"bulk" : 0,
"search" : 0
},
"throttled_millis" : 0,
"requests_per_second" : -1.0,
"throttled_until_millis" : 0,
"failures" : [
{
"reason" : {
"type" : "runtime_exception",
"reason" : "Unknown remote exception with reason=[RemoteTransportException[[*****][inet[/ip:port][search/phase/scan/scroll]]; nested: NullPointerException; ]"
}
}
]

Hi @Siva_Karan,

it would be good to know your ES version, the reindex request, relevant info from the ES log files and whether this happens every time you apply that reindex request or if it only happens for some of the requests.