PLT-6474: Server: Add elasticsearch/test endpoint to API. (#6792)

app/elasticsearch.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"net/http"
+
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/einterfaces"
+)
+
+func TestElasticsearch() *model.AppError {
+	if esI := einterfaces.GetElasticSearchInterface(); esI != nil {
+		if err := esI.TestConfig(); err != nil {
+			return err
+		}
+	} else {
+		err := model.NewAppError("TestElasticsearch", "ent.elasticsearch.test_config.license.error", nil, "", http.StatusNotImplemented)
+		return err
+	}
+
+	return nil
+}