# Connection failed to Elasticsearch

**URL:** https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328
**Category:** Elasticsearch
**Created:** [June 18, 2018, 3:16pm UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328 "2018-06-18T15:16:29Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![oumeyma](https://avatars.discourse-cdn.com/v4/letter/o/54ee81/32.png) [@oumeyma](https://discuss.elastic.co/u/oumeyma)
#### Post date: [June 18, 2018, 3:16pm UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328/1 "2018-06-18T15:16:30Z")

</div>

hi all,  
i have an error, can you help me  
Exception in thread "main" java.lang.NoClassDefFoundError: org/elasticsearch/index/IndexNotFoundException

---

<div class="post-metadata">

### Author: ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [June 18, 2018, 3:47pm UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328/2 "2018-06-18T15:47:29Z")

</div>

A class named `IndexNotFoundException` is missing in your classpath.

---

<div class="post-metadata">

### Author: ![oumeyma](https://avatars.discourse-cdn.com/v4/letter/o/54ee81/32.png) [@oumeyma](https://discuss.elastic.co/u/oumeyma)
#### Post date: [June 19, 2018, 10:14am UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328/3 "2018-06-19T10:14:59Z")

</div>

the error is

[2018-06-19T10:58:21,517][WARN][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]  
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root  
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.4.jar:6.2.4]  
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.4.jar:6.2.4]  
Caused by: java.lang.RuntimeException: can not run elasticsearch as root  
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.4.jar:6.2.4]  
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.4.jar:6.2.4]  
... 6 more

---

<div class="post-metadata">

### Author: ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [June 19, 2018, 3:26pm UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328/4 "2018-06-19T15:26:36Z")

</div>

That's another error which tells you that you

> can not run elasticsearch as root

---

<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 17, 2018, 3:26pm UTC](https://discuss.elastic.co/t/connection-failed-to-elasticsearch/136328/5 "2018-07-17T15:26:39Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.