Changes based on review comments

es.go

@@ -775,17 +775,14 @@ func (c *Client) DeleteIndex(indexName string) error {
 // Use case: You want to remove an index and all of its data. You also want to
 // specify query parameters such as timeout.
 func (c *Client) DeleteIndexWithQueryParameters(indexName string, queryParamMap map[string][]string) error {
-	queryParams := make([]string, len(queryParamMap))
+	queryParams := make([]string, 0, len(queryParamMap))
 	for key, value := range queryParamMap {
 		queryParams = append(queryParams, fmt.Sprintf("%s=%s", key,
 			strings.Join(value, ",")))
 	}
 	queryString := strings.Join(queryParams, "&")
 
-	var urlBuilder strings.Builder
-	urlBuilder.WriteString(fmt.Sprintf("%s?%s", indexName, queryString))
-
-	agent := c.buildDeleteRequest(urlBuilder.String())
+	agent := c.buildDeleteRequest(fmt.Sprintf("%s?%s", indexName, queryString))
 	var response acknowledgedResponse
 
 	err := handleErrWithStruct(agent, &response)