Elastic check timeout Task

 Sometime task take a very long time to complete such as reindex a big index. This will cause a timeout.

Actually the task is not terminate, but still continue on the background. How to check/list these background process?

1) list all tasks

GET _tasks?actions=indices*reindex
{
"query": {
"match_all": {}
   }
}

This will result such as this:

      "tasks" : {

        "kxXru-l2R92uy63iVzUYww:2365783289" : {

          "node" : "kxXru-l2R92uy63iVzUYww",

          "id" : 2365783289,

          "type" : "transport",

          "action" : "indices:data/write/reindex",

          "start_time_in_millis" : 1598930492885,

          "running_time_in_nanos" : 35909231518,

          "cancellable" : true,

          "headers" : { }

        }

      }

2) see details task

GET _tasks/kxXru-l2R92uy63iVzUYww:2365783289

  "query": {

    "match_all": {}

  }

}

This will resulted:

{

  "completed" : false,

  "task" : {

    "node" : "kxXru-l2R92uy63iVzUYww",

    "id" : 2365783289,

    "type" : "transport",

    "action" : "indices:data/write/reindex",

    "status" : {

      "total" : 346450,

      "updated" : 0,

      "created" : 262000,

      "deleted" : 0,

      "batches" : 263,

      "version_conflicts" : 0,

      "noops" : 0,

      "retries" : {

        "bulk" : 0,

        "search" : 0

      },

      "throttled_millis" : 0,

      "requests_per_second" : -1.0,

      "throttled_until_millis" : 0

    },

    "description" : "reindex from [my-event-b086cd38-fde3-4d0b-8403-154942d42a9f-2020-07-*] to [my-event-b086cd38-fde3-4d0b-8403-154942d42a9f-2020-07][_doc]",

    "start_time_in_millis" : 1598930492885,

    "running_time_in_nanos" : 261954757922,

    "cancellable" : true,

    "headers" : { }

  }

}