# ELK definitive guide book by Clinton Gormley & Zachary Tong

**URL:** <https://discuss.elastic.co/t/elk-definitive-guide-book-by-clinton-gormley-zachary-tong/111691>\
**Category:** Elasticsearch\
**Created:** [December 14, 2017, 6:53am UTC](https://discuss.elastic.co/t/elk-definitive-guide-book-by-clinton-gormley-zachary-tong/111691 "2017-12-14T06:53:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Arun\_Murugappan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/arun_murugappan/32/101630_2.png) [@Arun\_Murugappan](https://discuss.elastic.co/u/Arun_Murugappan)\
**Post date:** [December 14, 2017, 6:53am UTC](https://discuss.elastic.co/t/elk-definitive-guide-book-by-clinton-gormley-zachary-tong/111691/1 "2017-12-14T06:53:09Z")

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I have been reading this book "ELK definitive guide book by Clinton Gormley & Zachary Tong" for the past week or so. I have some doubts. On this ebook,page 6 under Talking to Elasticsearch. What is meant by "If using Java,elasticsearch comes with two in-built clients." What are clients in this case?. What is restful archticeture and API in relation to elastic search?

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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:** [January 11, 2018, 6:53am UTC](https://discuss.elastic.co/t/elk-definitive-guide-book-by-clinton-gormley-zachary-tong/111691/2 "2018-01-11T06:53:34Z")

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Closed on January 11, 2018, 6:53am UTC

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