# Elasticsearch is poisonous ~(+﹏+)~

**URL:** <https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573>\
**Category:** Elasticsearch\
**Created:** [March 26, 2018, 9:18am UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573 "2018-03-26T09:18:35Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ver007](https://avatars.discourse-cdn.com/v4/letter/v/3be4f8/32.png) [@ver007](https://discuss.elastic.co/u/ver007)\
**Post date:** [March 26, 2018, 9:18am UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573/1 "2018-03-26T09:18:36Z")

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😅  
Please forgive me for taking the liberty that Elasticsearch is poisonous. Each time ElasticSearch is updated, some query APIs connection APIs ，and previous versions are incompatible, Old code cannot directly use the new elasticsearch.jar 😅  
@dadoonet

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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:** [March 26, 2018, 9:30am UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573/2 "2018-03-26T09:30:49Z")

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Sure. Which client are you using?

The low level rest client should probably be more stable.

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**Author:** ![ver007](https://avatars.discourse-cdn.com/v4/letter/v/3be4f8/32.png) [@ver007](https://discuss.elastic.co/u/ver007)\
**Post date:** [March 26, 2018, 9:39am UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573/3 "2018-03-26T09:39:13Z")

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The old code uses elasticsearch 5.1.1 jar to connect the TCP server side. The new version elasticsearch 6.X is not compatible with the old version API call. I hope that API will retain the original way of calling.Thank you for the reply:sweat\_smile:

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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:** [March 26, 2018, 12:50pm UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573/4 "2018-03-26T12:50:50Z")

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With the low level client: yes.  
With the high level client: no.

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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:** [April 23, 2018, 12:51pm UTC](https://discuss.elastic.co/t/elasticsearch-is-poisonous/125573/5 "2018-04-23T12:51:17Z")

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