Issue search support elasticsearch (#9428)

* Issue search support elasticsearch

* Fix lint

* Add indexer name on app.ini

* add a warnning on SearchIssuesByKeyword

* improve code

vendor/github.com/olivere/elastic/v7/request.go

@@ -0,0 +1,123 @@
+// Copyright 2012-present Oliver Eilhard. All rights reserved.
+// Use of this source code is governed by a MIT-license.
+// See http://olivere.mit-license.org/license.txt for details.
+
+package elastic
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"runtime"
+	"strings"
+)
+
+// Elasticsearch-specific HTTP request
+type Request http.Request
+
+// NewRequest is a http.Request and adds features such as encoding the body.
+func NewRequest(method, url string) (*Request, error) {
+	req, err := http.NewRequest(method, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Add("User-Agent", "elastic/"+Version+" ("+runtime.GOOS+"-"+runtime.GOARCH+")")
+	req.Header.Add("Accept", "application/json")
+	req.Header.Set("Content-Type", "application/json")
+	return (*Request)(req), nil
+}
+
+// SetBasicAuth wraps http.Request's SetBasicAuth.
+func (r *Request) SetBasicAuth(username, password string) {
+	((*http.Request)(r)).SetBasicAuth(username, password)
+}
+
+// SetBody encodes the body in the request. You may pass a flag to
+// compress the request via gzip.
+func (r *Request) SetBody(body interface{}, gzipCompress bool) error {
+	switch b := body.(type) {
+	case string:
+		if gzipCompress {
+			return r.setBodyGzip(b)
+		}
+		return r.setBodyString(b)
+	default:
+		if gzipCompress {
+			return r.setBodyGzip(body)
+		}
+		return r.setBodyJson(body)
+	}
+}
+
+// setBodyJson encodes the body as a struct to be marshaled via json.Marshal.
+func (r *Request) setBodyJson(data interface{}) error {
+	body, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+	r.Header.Set("Content-Type", "application/json")
+	r.setBodyReader(bytes.NewReader(body))
+	return nil
+}
+
+// setBodyString encodes the body as a string.
+func (r *Request) setBodyString(body string) error {
+	return r.setBodyReader(strings.NewReader(body))
+}
+
+// setBodyGzip gzip's the body. It accepts both strings and structs as body.
+// The latter will be encoded via json.Marshal.
+func (r *Request) setBodyGzip(body interface{}) error {
+	switch b := body.(type) {
+	case string:
+		buf := new(bytes.Buffer)
+		w := gzip.NewWriter(buf)
+		if _, err := w.Write([]byte(b)); err != nil {
+			return err
+		}
+		if err := w.Close(); err != nil {
+			return err
+		}
+		r.Header.Add("Content-Encoding", "gzip")
+		r.Header.Add("Vary", "Accept-Encoding")
+		return r.setBodyReader(bytes.NewReader(buf.Bytes()))
+	default:
+		data, err := json.Marshal(b)
+		if err != nil {
+			return err
+		}
+		buf := new(bytes.Buffer)
+		w := gzip.NewWriter(buf)
+		if _, err := w.Write(data); err != nil {
+			return err
+		}
+		if err := w.Close(); err != nil {
+			return err
+		}
+		r.Header.Add("Content-Encoding", "gzip")
+		r.Header.Add("Vary", "Accept-Encoding")
+		r.Header.Set("Content-Type", "application/json")
+		return r.setBodyReader(bytes.NewReader(buf.Bytes()))
+	}
+}
+
+// setBodyReader writes the body from an io.Reader.
+func (r *Request) setBodyReader(body io.Reader) error {
+	rc, ok := body.(io.ReadCloser)
+	if !ok && body != nil {
+		rc = ioutil.NopCloser(body)
+	}
+	r.Body = rc
+	if body != nil {
+		switch v := body.(type) {
+		case *strings.Reader:
+			r.ContentLength = int64(v.Len())
+		case *bytes.Buffer:
+			r.ContentLength = int64(v.Len())
+		}
+	}
+	return nil
+}