Thanks very much, @filiphr.

elasticsearch-rest5-client doesn't transitively pull elasticsearch-java. So spring-boot-elasticsearch module alone can't be used without adding elasticsearch-java. I also believe that this low level client created to keep clients compatible with Elasticsearch version 8 and below to support latest Apache client 5. elastic/elasticsearch-java#1064

Hey @anbusampath, when I did this I didn't realize that there is now a spring-boot-starter-elasticsearch. The PR I did was for spring-boot-elasticsearch and to align that to how it was in Spring Boot 3. In Spring Boot 3 it was possible to only configure the low level Elasticsearch Rest Client, i.e. there was only spring-boot-starter-data-elasticsearch which brought the high level elastic-java dependency through spring-data-elasticsearch dependency.

In any case, in my opinion spring-boot-elasticsearch should not enforce the elasticsearch-java dependency on everyone. However, I do believe that it is OK for spring-boot-starter-elasticsearch to be a bit more opinionated and pull the elasticsearch-java dependency. I created #48141 for this. @wilkinsona, I'll leave it up to you and the Spring Boot team to decide whether the starter should be more opinionated or not.

However, I do believe that it is OK for spring-boot-starter-elasticsearch to be a bit more opinionated and pull the elasticsearch-java dependency.

This makes more sense.