# Problem in updating beat.hostname

**URL:** <https://discuss.elastic.co/t/problem-in-updating-beat-hostname/50409>\
**Category:** Logstash\
**Created:** [May 19, 2016, 8:27am UTC](https://discuss.elastic.co/t/problem-in-updating-beat-hostname/50409 "2016-05-19T08:27:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![preehana](https://avatars.discourse-cdn.com/v4/letter/p/4af34b/32.png) [@preehana](https://discuss.elastic.co/u/preehana)\
**Post date:** [May 19, 2016, 8:27am UTC](https://discuss.elastic.co/t/problem-in-updating-beat-hostname/50409/1 "2016-05-19T08:27:52Z")

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Hello,

I am facing a problem in updating beat.hostname using mutate filter.I have made the following changes in my logstash configuration file .

input {  
beats {  
port =\> "5044"  
}  
}  
filter {  
mutate {  
update =\> { "beat.hostname" =\> "preehana" }  
}  
}  
output {  
elasticsearch {  
hosts =\> "localhost:9292"  
action =\> "index"  
index =\> "filebeatl"  
}  
stdout { codec =\> rubydebug }  
}

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [May 19, 2016, 10:38am UTC](https://discuss.elastic.co/t/problem-in-updating-beat-hostname/50409/2 "2016-05-19T10:38:59Z")

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You're not using the correct syntax for nested fields. See below.

[https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#logstash-config-field-references](https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#logstash-config-field-references)

---

<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:** [July 6, 2017, 4:56am UTC](https://discuss.elastic.co/t/problem-in-updating-beat-hostname/50409/3 "2017-07-06T04:56:59Z")

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