# Logstash HTTP client

**URL:** <https://discuss.elastic.co/t/logstash-http-client/339483>\
**Category:** Logstash\
**Created:** [July 27, 2023, 10:55pm UTC](https://discuss.elastic.co/t/logstash-http-client/339483 "2023-07-27T22:55:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Arjun\_Nambiar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/arjun_nambiar/32/123884_2.png) [@Arjun\_Nambiar](https://discuss.elastic.co/u/Arjun_Nambiar)\
**Post date:** [July 27, 2023, 10:55pm UTC](https://discuss.elastic.co/t/logstash-http-client/339483/1 "2023-07-27T22:55:00Z")

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I have an Elasticsearch cluster running on AWS which has an Elastic Load balancer(ELB) in front of it. I am scanning the ELB log file to find the clients writing to the Elasticsearch cluster. Logstash is also one of the clients writing to it. However when I try to filter the log files using the user\_agent string, I cannot find anything resembling Logstash. What user\_agent string does Logstash's HTTP clinet use when writing to Elasticsearch ?

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [July 27, 2023, 11:55pm UTC](https://discuss.elastic.co/t/logstash-http-client/339483/2 "2023-07-27T23:55:08Z")

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> [@Arjun\_Nambiar](#):
>
> What user\_agent string does Logstash's HTTP clinet use when writing to Elasticsearch ?

Probably "Manticore 0.9.1" or somesuch.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 24, 2023, 11:55pm UTC](https://discuss.elastic.co/t/logstash-http-client/339483/3 "2023-08-24T23:55:29Z")

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