# Node class, Client interface and RestHighLevelClient

**URL:** <https://discuss.elastic.co/t/node-class-client-interface-and-resthighlevelclient/248665>\
**Category:** Elasticsearch\
**Created:** [September 15, 2020, 11:26am UTC](https://discuss.elastic.co/t/node-class-client-interface-and-resthighlevelclient/248665 "2020-09-15T11:26:11Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**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:** [September 15, 2020, 11:57am UTC](https://discuss.elastic.co/t/node-class-client-interface-and-resthighlevelclient/248665/2 "2020-09-15T11:57:16Z")

</div>

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> [@Pete\_Watcharawit](#):
>
> How do I gracefully replace this with the new RestHighLevelClient class?

Have a look at [Initialization | Java REST Client [7.17] | Elastic](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high-getting-started-initialization.html)

> [@Pete\_Watcharawit](#):
>
> Is there a way to convert RestHighLevelClient into a Client object to store it in Map\<String, Client\> instance?

Why would you do this? It's threadsafe so you need only one instance I believe.

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