Add json starter so that Elasticsearch uses Jackson mapper by default

Closes gh-32906

Author: wilkinsona

Diff for: spring-boot-project/spring-boot-starters/spring-boot-starter-data-elasticsearch/build.gradle

@@ -7,4 +7,6 @@ description = "Starter for using Elasticsearch search and analytics engine and S
 dependencies {
 	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter"))
 	api("org.springframework.data:spring-data-elasticsearch")
+
+	runtimeOnly(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-json"))
 }