# Graylog v2.4 issue

**URL:** <https://community.graylog.org/t/graylog-v2-4-issue/3617>\
**Category:** Graylog Central (peer support)\
**Created:** [December 25, 2017, 3:57pm UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617 "2017-12-25T15:57:38Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![kieulam141](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/kieulam141/32/931_2.png) [@kieulam141](https://community.graylog.org/u/kieulam141)\
**Post date:** [December 25, 2017, 3:57pm UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/1 "2017-12-25T15:57:38Z")

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I have just upgraded my graylog cluster to v2.4.But I got this error.

 ![Screenshot_3](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/d/d6bff52c47c7bafc8d8477c8f071bc340cc2cd0b.png)

And I got this error when query in web interface.

 ![Screenshot_2](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/0/032d6fe17beac8565eab2ea558a56d9aa6f13acc.png)

My elasticsearch version is 5.5.1.I configed the graylog cluster and elasticsearch cluster the same document.  
How can I fix it?  
Thanks !

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**Author:** ![kieulam141](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/kieulam141/32/931_2.png) [@kieulam141](https://community.graylog.org/u/kieulam141)\
**Post date:** [December 26, 2017, 7:53am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/2 "2017-12-26T07:53:20Z")

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The more error is

 ![Screenshot_4](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/c/cf235941a985cca293265b26745ea4d1faa101f8.png)

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<div class="post-metadata">

**Author:** ![kieulam141](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/kieulam141/32/931_2.png) [@kieulam141](https://community.graylog.org/u/kieulam141)\
**Post date:** [December 26, 2017, 11:21am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/3 "2017-12-26T11:21:32Z")

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When I call API to the metadata on mongodb, It worked.But when I call API to the data on elastichsearch, It allway reply is "{  
“type”: “ApiError”,  
“message”: “No Server is assigned to client to connect”  
}"  
My elasticsearch cluster version is stiill 5.5.1 with my old graylog cluster version 2.3.1.  
Is this error cause of old elasticsearch version???

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**Author:** ![kieulam141](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/kieulam141/32/931_2.png) [@kieulam141](https://community.graylog.org/u/kieulam141)\
**Post date:** [December 26, 2017, 11:56am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/4 "2017-12-26T11:56:33Z")

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My connection config between graylog and elasticsearch is:" elasticsearch\_hosts = [http://elas1-ip-private:9200](http://elas1-ip-private:9200),[http://elas2-ip-private:9200](http://elas2-ip-private:9200),[http://elas3-ip-private:9200](http://elas3-ip-private:9200)"

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**Author:** ![jan](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/jan/32/11_2.png) [@jan](https://community.graylog.org/u/jan)\
**Post date:** [December 27, 2017, 10:20am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/5 "2017-12-27T10:20:33Z")

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how did you upgrade?

Did you consider the upgrade to the latest stable Elasticsearch 5.6 release?

Be a little more verbose on details of your setup and somebody might help.

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**Author:** ![kieulam141](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/kieulam141/32/931_2.png) [@kieulam141](https://community.graylog.org/u/kieulam141)\
**Post date:** [December 27, 2017, 10:50am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/6 "2017-12-27T10:50:28Z")

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Hi Jan,

I found error cause of enable option “elasticsearch\_discovery\_filter = rack:42”. I disabled it, then It worked.  
And should I upgrade elasticsearch v5.5 t v5.6?

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**Author:** ![jochen](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/jochen/32/8_2.png) [@jochen](https://community.graylog.org/u/jochen)\
**Post date:** [January 3, 2018, 8:12am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/7 "2018-01-03T08:12:18Z")

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> [@kieulam141](#):
>
> And should I upgrade elasticsearch v5.5 t v5.6?

Yes, I would recommend upgrading to the latest stable version of Elasticsearch in the 5.x branch.

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/3X/c/7/c7c09c6b5099570133d6502b83f50ba4430de5b6.png) [@system](https://community.graylog.org/u/system)\
**Post date:** [January 17, 2018, 8:12am UTC](https://community.graylog.org/t/graylog-v2-4-issue/3617/8 "2018-01-17T08:12:32Z")

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