elastic v6 not work correctly with http proxy

[ermazi]

Which version of Elastic are you using?

[x] elastic.v6 (for Elasticsearch 6.x)

Please describe the expected behavior

client with http proxy should work well.

Please describe the actual behavior

but all settings are omitted

Any steps to reproduce the behavior?

	proxyUrl, _ := url.Parse("http://proxyIP1:48888")

	client, err := elastic.NewClient(
		elastic.SetURL("http://esNode01:9200"),
		elastic.SetSniff(false),
		elastic.SetHttpClient(
			&http.Client{
				Transport: &http.Transport{
					MaxIdleConnsPerHost: 10,
					Proxy:               http.ProxyURL(proxyUrl),
				},
				Timeout: 10 * time.Second,
			}),
	)

	if err != nil {
		log.Printf("err: %v", err)
		return
	}

	query := elastic.NewBoolQuery()
	termQuery := elastic.NewTermQuery("term1", "termValue1")
	rangeQuery := elastic.NewRangeQuery("@timestamp").Gte(time.Now().Add(-48 * time.Hour)).Lte(time.Now().Add(-24 * time.Hour))

	query = query.Must(termQuery, rangeQuery)

	searchResult, err := client.Search().
		Index("index01*").
		Query(query).
		From(0).Size(1).
		Pretty(true).
		Do(context.Background())

	if err != nil {
		log.Printf("search err: %v", err)
		return
	}

	log.Printf("%+v", len(searchResult.Hits.Hits))

result should be 1, but 10

it seems that not condition passed when use Proxy~