fix pipeline aggregations on doc count

pkg/tsdb/elasticsearch/models.go

@@ -73,5 +73,8 @@ func isPipelineAgg(metricType string) bool {
 
 func describeMetric(metricType, field string) string {
 	text := metricAggType[metricType]
+	if metricType == countType {
+		return text
+	}
 	return text + " " + field
 }

pkg/tsdb/elasticsearch/time_series_query.go

@@ -89,15 +89,29 @@ func (e *timeSeriesQuery) execute() (*tsdb.Response, error) {
 		}
 
 		for _, m := range q.Metrics {
-			if m.Type == "count" {
+			if m.Type == countType {
 				continue
 			}
 
 			if isPipelineAgg(m.Type) {
 				if _, err := strconv.Atoi(m.PipelineAggregate); err == nil {
-					aggBuilder.Pipeline(m.ID, m.Type, m.PipelineAggregate, func(a *es.PipelineAggregation) {
+					var appliedAgg *MetricAgg
+					for _, pipelineMetric := range q.Metrics {
+						if pipelineMetric.ID == m.PipelineAggregate {
+							appliedAgg = pipelineMetric
+							break
+						}
+					}
+					if appliedAgg != nil {
+						bucketPath := m.PipelineAggregate
+						if appliedAgg.Type == countType {
+							bucketPath = "_count"
+						}
+
+						aggBuilder.Pipeline(m.ID, m.Type, bucketPath, func(a *es.PipelineAggregation) {
 							a.Settings = m.Settings.MustMap()
 						})
+					}
 				} else {
 					continue
 				}

pkg/tsdb/elasticsearch/time_series_query_test.go

@@ -418,6 +418,38 @@ func TestExecuteTimeSeriesQuery(t *testing.T) {
 			So(pl.BucketPath, ShouldEqual, "3")
 		})
 
+		Convey("With moving average doc count", func() {
+			c := newFakeClient(5)
+			_, err := executeTsdbQuery(c, `{
+				"timeField": "@timestamp",
+				"bucketAggs": [
+					{ "type": "date_histogram", "field": "@timestamp", "id": "4" }
+				],
+				"metrics": [
+					{ "id": "3", "type": "count", "field": "select field" },
+					{
+						"id": "2",
+						"type": "moving_avg",
+						"field": "3",
+						"pipelineAgg": "3"
+					}
+				]
+			}`, from, to, 15*time.Second)
+			So(err, ShouldBeNil)
+			sr := c.multisearchRequests[0].Requests[0]
+
+			firstLevel := sr.Aggs[0]
+			So(firstLevel.Key, ShouldEqual, "4")
+			So(firstLevel.Aggregation.Type, ShouldEqual, "date_histogram")
+			So(firstLevel.Aggregation.Aggs, ShouldHaveLength, 1)
+
+			movingAvgAgg := firstLevel.Aggregation.Aggs[0]
+			So(movingAvgAgg.Key, ShouldEqual, "2")
+			So(movingAvgAgg.Aggregation.Type, ShouldEqual, "moving_avg")
+			pl := movingAvgAgg.Aggregation.Aggregation.(*es.PipelineAggregation)
+			So(pl.BucketPath, ShouldEqual, "_count")
+		})
+
 		Convey("With broken moving average", func() {
 			c := newFakeClient(5)
 			_, err := executeTsdbQuery(c, `{
@@ -483,6 +515,34 @@ func TestExecuteTimeSeriesQuery(t *testing.T) {
 			So(plAgg.BucketPath, ShouldEqual, "3")
 		})
 
+		Convey("With derivative doc count", func() {
+			c := newFakeClient(5)
+			_, err := executeTsdbQuery(c, `{
+				"timeField": "@timestamp",
+				"bucketAggs": [
+					{ "type": "date_histogram", "field": "@timestamp", "id": "4" }
+				],
+				"metrics": [
+					{ "id": "3", "type": "count", "field": "select field" },
+					{
+						"id": "2",
+						"type": "derivative",
+						"pipelineAgg": "3"
+					}
+				]
+			}`, from, to, 15*time.Second)
+			So(err, ShouldBeNil)
+			sr := c.multisearchRequests[0].Requests[0]
+
+			firstLevel := sr.Aggs[0]
+			So(firstLevel.Key, ShouldEqual, "4")
+			So(firstLevel.Aggregation.Type, ShouldEqual, "date_histogram")
+
+			derivativeAgg := firstLevel.Aggregation.Aggs[0]
+			So(derivativeAgg.Key, ShouldEqual, "2")
+			plAgg := derivativeAgg.Aggregation.Aggregation.(*es.PipelineAggregation)
+			So(plAgg.BucketPath, ShouldEqual, "_count")
+		})
 	})
 }
 

public/app/plugins/datasource/elasticsearch/query_builder.ts

@@ -266,7 +266,14 @@ export class ElasticQueryBuilder {
 
       if (queryDef.isPipelineAgg(metric.type)) {
         if (metric.pipelineAgg && /^\d*$/.test(metric.pipelineAgg)) {
+          const appliedAgg = queryDef.findMetricById(target.metrics, metric.pipelineAgg);
+          if (appliedAgg) {
+            if (appliedAgg.type === 'count') {
+              metricAgg = { buckets_path: '_count' };
+            } else {
               metricAgg = { buckets_path: metric.pipelineAgg };
+            }
+          }
         } else {
           continue;
         }

public/app/plugins/datasource/elasticsearch/query_def.ts

@@ -213,6 +213,9 @@ export function describeOrder(order) {
 
 export function describeMetric(metric) {
   const def = _.find(metricAggTypes, { value: metric.type });
+  if (!def.requiresField && !isPipelineAgg(metric.type)) {
+    return def.text;
+  }
   return def.text + ' ' + metric.field;
 }
 
@@ -236,3 +239,7 @@ export function defaultMetricAgg() {
 export function defaultBucketAgg() {
   return { type: 'date_histogram', id: '2', settings: { interval: 'auto' } };
 }
+
+export const findMetricById = (metrics: any[], id: any) => {
+  return _.find(metrics, { id: id });
+};

public/app/plugins/datasource/elasticsearch/specs/query_builder.test.ts

@@ -250,6 +250,31 @@ describe('ElasticQueryBuilder', () => {
     expect(firstLevel.aggs['2'].moving_avg.buckets_path).toBe('3');
   });
 
+  it('with moving average doc count', () => {
+    const query = builder.build({
+      metrics: [
+        {
+          id: '3',
+          type: 'count',
+          field: 'select field',
+        },
+        {
+          id: '2',
+          type: 'moving_avg',
+          field: '3',
+          pipelineAgg: '3',
+        },
+      ],
+      bucketAggs: [{ type: 'date_histogram', field: '@timestamp', id: '4' }],
+    });
+
+    const firstLevel = query.aggs['4'];
+
+    expect(firstLevel.aggs['2']).not.toBe(undefined);
+    expect(firstLevel.aggs['2'].moving_avg).not.toBe(undefined);
+    expect(firstLevel.aggs['2'].moving_avg.buckets_path).toBe('_count');
+  });
+
   it('with broken moving average', () => {
     const query = builder.build({
       metrics: [
@@ -304,6 +329,30 @@ describe('ElasticQueryBuilder', () => {
     expect(firstLevel.aggs['2'].derivative.buckets_path).toBe('3');
   });
 
+  it('with derivative doc count', () => {
+    const query = builder.build({
+      metrics: [
+        {
+          id: '3',
+          type: 'count',
+          field: 'select field',
+        },
+        {
+          id: '2',
+          type: 'derivative',
+          pipelineAgg: '3',
+        },
+      ],
+      bucketAggs: [{ type: 'date_histogram', field: '@timestamp', id: '4' }],
+    });
+
+    const firstLevel = query.aggs['4'];
+
+    expect(firstLevel.aggs['2']).not.toBe(undefined);
+    expect(firstLevel.aggs['2'].derivative).not.toBe(undefined);
+    expect(firstLevel.aggs['2'].derivative.buckets_path).toBe('_count');
+  });
+
   it('with histogram', () => {
     const query = builder.build({
       metrics: [{ id: '1', type: 'count' }],