Getting Elasticsearch response - json

Question

I am using gin framework to built an Api to get data from Elastic.
Issue is that when I run the application, I get response successfully in the first request but after that in any subsequent request I am getting error:
Error parsing the response body: EOF
Elastic configuration:
var cfg = elasticsearch.Config{
Password: GetConnectConfig().esPassword,
Username: GetConnectConfig().esUserName,
Addresses: GetConnectConfig().esHost,
Logger: &estransport.ColorLogger{
Output: os.Stdout,
}
My request handler function looks like:
func Search() gin.HandlerFunc {
client, err := elasticsearch.NewClient(cfg)
if err != nil {
log.Fatalf("elastic configuration failed %s", err)
}
res, err := client.Search(
client.Search.WithIndex(Index_Name),
client.Search.WithSize(10),
client.Search.WithPretty(),
)
if err != nil {
log.Fatalf("elastic failed to respond %s", err)
}
return func(c *gin.Context) {
r := map[string]interface{}{}
if err := json.NewDecoder(res.Body).Decode(&r); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": err})
log.Fatalf("Error parsing the response body: %s", err) // Error
} else {
for _, hit := range r["hits"].(map[string]interface{})["hits"].([]interface{}) {
log.Printf(" * ID=%s, %s", hit.(map[string]interface{})["_id"], hit.(map[string]interface{})["_source"])
}
c.JSON(http.StatusOK, "success")
}
}
}
As I told, I am able to get the response only in the very first request each time I run the application.
I am not sure what is the cause of error here.
I also tried with closing the response body after search by adding:
defer res.Body.Close()
but now I am getting following error:
Error parsing the response body: http2: response body closed

Answer 1

defer res.Body.Close() should be inside the func(c *gin.Context){} yo. can move your search initialization inside the func and do a close inside there something like and client can be injected as a dependency here.
return func(c *gin.Context) {
res, err := client.Search(
client.Search.WithIndex(Index_Name),
client.Search.WithSize(10),
client.Search.WithPretty(),
)
defer res.Body.Close()
}
}