Revert "Temporarily depend on old low-level Elasticsearch client"

This reverts commit bf76c1e41e.

See gh-46061

module/spring-boot-data-elasticsearch/build.gradle

@@ -35,8 +35,6 @@ dependencies {
 	optional(project(":module:spring-boot-health"))
 	optional(project(":module:spring-boot-reactor"))
 
-	runtimeOnly("org.elasticsearch.client:elasticsearch-rest-client")
-
 	dockerTestImplementation(project(":core:spring-boot-test"))
 	dockerTestImplementation(project(":test-support:spring-boot-docker-test-support"))
 	dockerTestImplementation(testFixtures(project(":core:spring-boot-autoconfigure")))

platform/spring-boot-dependencies/build.gradle

@@ -365,11 +365,6 @@ bom {
 				managedBy "Spring Data Bom"
 			}
 		}
-		group("org.elasticsearch.client") {
-			modules = [
-				"elasticsearch-rest-client"
-			]
-		}
 		group("co.elastic.clients") {
 			modules = [
 				"elasticsearch-java"