Remove redundant annotation @ResponseBody

[donemin]

Description

@Responsebody on method, already defined at @RestController annotation

Issues Resolved

n/a

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[donemin]

@reta close #251 and reopen this.

[reta]

@reta close #251 and reopen this.

Thanks @donemin , please remove unused import:

 * What went wrong:
Execution failed for task ':spring-data-opensearch-examples:spring-boot-gradle:spotlessJavaCheck'.
> The following files had format violations:
      src/main/java/org/opensearch/data/example/rest/MarketplaceRestController.java
          @@ -13,7 +13,6 @@
           import·org.springframework.web.bind.annotation.GetMapping;
           import·org.springframework.web.bind.annotation.RequestMapping;
           import·org.springframework.web.bind.annotation.RequestParam;
          -import·org.springframework.web.bind.annotation.ResponseBody;
           import·org.springframework.web.bind.annotation.RestController;
           
           @RestController
  Run './gradlew :spring-data-opensearch-examples:spring-boot-gradle:spotlessApply' to fix these violations.

[reta]

Thank you @donemin !