# Issues renaming fields

**URL:** https://discuss.elastic.co/t/issues-renaming-fields/267588
**Category:** Logstash
**Created:** [March 18, 2021, 2:18am UTC](https://discuss.elastic.co/t/issues-renaming-fields/267588 "2021-03-18T02:18:38Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Sketchy](https://avatars.discourse-cdn.com/v4/letter/s/258eb7/32.png) [@Sketchy](https://discuss.elastic.co/u/Sketchy)
#### Post date: [March 18, 2021, 2:18am UTC](https://discuss.elastic.co/t/issues-renaming-fields/267588/1 "2021-03-18T02:18:38Z")

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I am having issues with renaming a large number of fields, I am trying to create them as nested fields to organise them better in elastic. I keep getting \_mutate\_error and also this in the log.

> {:exception=\>"class org.jruby.RubyString cannot be cast to class org.logstash.ConvertedList (org.jruby.RubyString and org.logstash.ConvertedList are in unnamed module of loader 'app')"}

Is this "scheme" below suitable? Is there some kind of order that I should be doing these renames in? or breaking them up into separate mutate blocks?  
Wondering if its even worth it and I just stick to the original field names?

```auto
mutate {
        rename => {
            "application" => "[application][name]"
            "applicationid" => "[application][id]"
            "skillset" => "[skillset][name]"
            "contacttype" => "[skillset][contact_type]"
            "skillsetid" => "[skillset][id]"
            "site" => "[skillset][site_name]"
            "siteid" => "[skillset][site_id]"
            "skillsetabandoneddelay" => "[skillset][stat][calls_abandoned_delay]"
            "callsanswered" => "[skillset][stat][calls_answered]"
            "callsansweredafterthreshold" => "[skillset][stat][calls_answered_after_threshold]"
            "callsanswereddelay" => "[skillset][stat][calls_answered_delay]"
            "callsoffered" => "[skillset][stat][calls_offered]"
            "skillsetabandoned" => "[skillset][stat][calls_abandoned]"
            "skillsetabandonedaftthreshold" => "[skillset][stat][calls_abandoned_after_threshold]"
            "maxanswereddelay" => "[skillset][stat][max_answered_delay]"
            "maxskillsetabandoneddelay" => "[skillset][stat][max_skillset_abandoned_delay]"
            "netcallsanswered" => "[skillset][stat][net_calls_answered]"
            "virtualcallsoffered" => "[skillset][stat][virtual_calls_offered]"
            "virtualcallsabandoned" => "[skillset][stat][virtual_calls_abandoned]"
            "virtualcallsabnaftthreshold" => "[skillset][stat][virtual_calls_abandoned_after_threshold]"
            "dnoutextcallstalktime" => "[dn][outbound][external][talk_time]"
            "dnoutintcallstalktime" => "[dn][outbound][internal][talk_time]"
            "activetime" => "[skillset][duration][active_time]"
            "allagentbusytime" => "[skillset][duration][all_agents_busy_time]"
            "talktime" => "[skillset][duration][talk_time]"
            "waittime" => "[skillset][duration][wait_time]"
            "maxcapacitytotalstaffedtime" => "[skillset][duration][max_capacity_total_staffed_time]"
            "maxcapacityidletime" => "[skillset][duration][max_capacity_idle_time]"
            "idletime" => "[skillset][duration][idle_time]"
            "notreadytime" => "[skillset][duration][not_ready_time]"
            "totalstaffedtime" => "[skillset][duration][total_staffed_time]"
            "postcallprocessingtime" => "[skillset][duration][post_call_proc_time]"
        }
    }

```

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 15, 2021, 2:19am UTC](https://discuss.elastic.co/t/issues-renaming-fields/267588/2 "2021-04-15T02:19:34Z")

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