# What is mean "cluster\_uuid" : "\_na\_" in ES v2.4.1?

**URL:** <https://discuss.elastic.co/t/what-is-mean-cluster-uuid--na--in-es-v2-4-1/61825>\
**Category:** Elasticsearch\
**Created:** [September 29, 2016, 2:42pm UTC](https://discuss.elastic.co/t/what-is-mean-cluster-uuid--na--in-es-v2-4-1/61825 "2016-09-29T14:42:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![KIVagant](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kivagant/32/7182_2.png) [@KIVagant](https://discuss.elastic.co/u/KIVagant)\
**Post date:** [September 29, 2016, 2:42pm UTC](https://discuss.elastic.co/t/what-is-mean-cluster-uuid--na--in-es-v2-4-1/61825/1 "2016-09-29T14:42:08Z")

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Hello. I have updated ElasticSearch to v2.4.1 and now I see a new response attribute "cluster\_uuid".  
Why it has "_na_" value and what is mean?

```
curl localhost:9200
{
  "name" : "test1",
  "cluster_name" : "elka_test",
  "cluster_uuid" : "_na_",
  "version" : {
    "number" : "2.4.1",
    "build_hash" : "c67dc32e24162035d18d6fe1e952c4cbcbe79d16",
    "build_timestamp" : "2016-09-27T18:57:55Z",
    "build_snapshot" : false,
    "lucene_version" : "5.5.2"
  },
  "tagline" : "You Know, for Search"
}
```

---

<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 5, 2017, 10:16pm UTC](https://discuss.elastic.co/t/what-is-mean-cluster-uuid--na--in-es-v2-4-1/61825/2 "2017-07-05T22:16:05Z")

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