Elasticsearch client API

Question

my question is about different Elasticsearch client APIs .. I wanted to migrate form Elasticsearch 6.2 to Elasticsearch 7

• Currently i am using JEST Client library with elasticsearch v6.2, but its absolute now therefore with the upgrade i wanted to used client library provided by Elasticsearch, but number of libraries provided by Elasticsearch make me lost which one to use with v7.15

these are following ES client libraries

• Java client :
  • deprecated in 7.9 https://www.elastic.co/guide/en/elasticsearch/client/java-api/7.9/java-docs-index.html
• REST clients: there are two REST clients
  • Low level REST client.
    • request marshalling and response un-marshalling is handled by the client itself.
      • internally uses "Apache Http Async Client"
      • provide some basic domentation of rintailizing, request/response with java code
  • High Level client
    • deprecated in 7.15
    • it a layer on top of Low level client
    • performs request marshalling and response un-marshalling is handled by the client itself.
    • provides documentation with Java code https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.15/java-rest-high-document-index.html

so its look like Elasticsearch 7.15 can only use "Low level REST client" because other two clients " Java client " and "RES High Level clien" are deprecated. and using REST LOW level client require to write lots of basic codes like marschalling /un-marshalling etc

is my understating correct ? is there any other Elasticsearch client available /better to use to migrate to 7.15 ?

Answer 1

You are right, this is the only way for this version.

But starting with 7.16 version there is a new client ⇾ ElasticsearchClient handling marshalling and unmarshalling by itself (You pass class type as a parameter with calls) with already pretty neet documentation existing:

https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/master/connecting.html