Adding xpack code for ES ML job metricset (#8129)

* Adding job_stats xpack monitoring documents

* Fixing type assertions

metricbeat/module/elasticsearch/ml_job/data_xpack.go

@@ -0,0 +1,73 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package ml_job
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/elastic/beats/libbeat/common"
+	"github.com/elastic/beats/metricbeat/helper/elastic"
+	"github.com/elastic/beats/metricbeat/mb"
+	"github.com/elastic/beats/metricbeat/module/elasticsearch"
+)
+
+func eventsMappingXPack(r mb.ReporterV2, m *MetricSet, content []byte) error {
+	info, err := elasticsearch.GetInfo(m.HTTP, m.HTTP.GetURI())
+	if err != nil {
+		return err
+	}
+
+	var data map[string]interface{}
+	err = json.Unmarshal(content, &data)
+	if err != nil {
+		return err
+	}
+
+	jobs, ok := data["jobs"]
+	if !ok {
+		return elastic.MakeErrorForMissingField("jobs", elastic.Elasticsearch)
+	}
+
+	jobsArr, ok := jobs.([]interface{})
+	if !ok {
+		return fmt.Errorf("jobs is not an array of objects")
+	}
+
+	for _, job := range jobsArr {
+		job, ok = job.(map[string]interface{})
+		if !ok {
+			continue
+		}
+
+		event := mb.Event{}
+		event.RootFields = common.MapStr{
+			"cluster_uuid": info.ClusterID,
+			"timestamp":    common.Time(time.Now()),
+			"interval_ms":  m.Module().Config().Period / time.Millisecond,
+			"type":         "job_stats",
+			"job_stats":    job,
+		}
+
+		event.Index = elastic.MakeXPackMonitoringIndexName(elastic.Elasticsearch)
+		r.Event(event)
+	}
+
+	return nil
+}

metricbeat/module/elasticsearch/ml_job/ml_job.go

@@ -74,9 +74,13 @@ func (m *MetricSet) Fetch(r mb.ReporterV2) {
 		return
 	}
 
-	err = eventsMapping(r, content)
-	if err != nil {
-		r.Error(err)
-		return
+	if m.XPack {
+		eventsMappingXPack(r, m, content)
+	} else {
+		err = eventsMapping(r, content)
+		if err != nil {
+			r.Error(err)
+			return
+		}
 	}
 }