MM-6992 Added highlighting to elasticsearch results (#8861)

* MM-6992 Added highlighting to elasticsearch results

* Added a unique type for post search matches

* Fixed Elasticsearch matches not being sent through API

model/client4.go

@@ -2127,6 +2127,17 @@ func (c *Client4) SearchPosts(teamId string, terms string, isOrSearch bool) (*Po
 	}
 }
 
+// SearchPosts returns any posts with matching terms string, including .
+func (c *Client4) SearchPostsWithMatches(teamId string, terms string, isOrSearch bool) (*PostSearchResults, *Response) {
+	requestBody := map[string]interface{}{"terms": terms, "is_or_search": isOrSearch}
+	if r, err := c.DoApiPost(c.GetTeamRoute(teamId)+"/posts/search", StringInterfaceToJson(requestBody)); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return PostSearchResultsFromJson(r.Body), BuildResponse(r)
+	}
+}
+
 // DoPostAction performs a post action.
 func (c *Client4) DoPostAction(postId, actionId string) (bool, *Response) {
 	if r, err := c.DoApiPost(c.GetPostRoute(postId)+"/actions/"+actionId, ""); err != nil {

model/post_search_results.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type PostSearchMatches map[string][]string
+
+type PostSearchResults struct {
+	*PostList
+	Matches PostSearchMatches `json:"matches"`
+}
+
+func MakePostSearchResults(posts *PostList, matches PostSearchMatches) *PostSearchResults {
+	return &PostSearchResults{
+		posts,
+		matches,
+	}
+}
+
+func (o *PostSearchResults) ToJson() string {
+	copy := *o
+	copy.PostList.StripActionIntegrations()
+	b, err := json.Marshal(&copy)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func PostSearchResultsFromJson(data io.Reader) *PostSearchResults {
+	var o *PostSearchResults
+	json.NewDecoder(data).Decode(&o)
+	return o
+}