ELK definitive guide book by Clinton Gormley & Zachary Tong

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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