Add response close go client (#2828)

* I think response need to close.
The "Go package documentation" calls the Close method.
https://pkg.go.dev/github.com/opensearch-project/opensearch-go#NewClient

Signed-off-by: sheltie <sheltie.fusafusa@gmail.com>

* delete defer

Signed-off-by: sheltie <sheltie.fusafusa@gmail.com>

* Revert "delete defer"

This reverts commit 6852b1c67cdde37c97640f05340354ea51b29fb9.

Signed-off-by: sheltie <sheltie.fusafusa@gmail.com>

---------

Signed-off-by: sheltie <sheltie.fusafusa@gmail.com>

_clients/go.md

@@ -271,6 +271,7 @@ func main() {
     }
     fmt.Println("Inserting a document")
     fmt.Println(insertResponse)
+    defer insertResponse.Body.Close()
    
     // Perform bulk operations.
     blk, err := client.Bulk(
@@ -314,6 +315,7 @@ func main() {
     }
     fmt.Println("Searching for a document")
     fmt.Println(searchResponse)
+    defer searchResponse.Body.Close()
 
     // Delete the document.
     delete := opensearchapi.DeleteRequest{
@@ -328,6 +330,7 @@ func main() {
     }
     fmt.Println("Deleting a document")
     fmt.Println(deleteResponse)
+    defer deleteResponse.Body.Close()
 
     // Delete the previously created index.
     deleteIndex := opensearchapi.IndicesDeleteRequest{
@@ -341,6 +344,7 @@ func main() {
     }
     fmt.Println("Deleting the index")
     fmt.Println(deleteIndexResponse)
+    defer deleteIndexResponse.Body.Close()
 }
 ```
 {% include copy.html %}