elasticsearch: minor refactor

Handle all replacements if interval template variables in the client.
Fix issue with client and different versions.
Adds better tests of the client

pkg/tsdb/elasticsearch/client/client.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"path"
+	"strconv"
 	"strings"
 	"time"
 
@@ -25,6 +26,10 @@ var (
 	clientLog = log.New(loggerName)
 )
 
+var newDatasourceHttpClient = func(ds *models.DataSource) (*http.Client, error) {
+	return ds.GetHttpClient()
+}
+
 // Client represents a client which can interact with elasticsearch api
 type Client interface {
 	GetVersion() int
@@ -57,23 +62,18 @@ var NewClient = func(ctx context.Context, ds *models.DataSource, timeRange *tsdb
 		return nil, err
 	}
 
-	bc := &baseClientImpl{
-		ctx:       ctx,
-		ds:        ds,
-		version:   version,
-		timeField: timeField,
-		indices:   indices,
-	}
-
 	clientLog.Debug("Creating new client", "version", version, "timeField", timeField, "indices", strings.Join(indices, ", "))
 
 	switch version {
-	case 2:
-		return newV2Client(bc)
-	case 5:
-		return newV5Client(bc)
-	case 56:
-		return newV56Client(bc)
+	case 2, 5, 56:
+		return &baseClientImpl{
+			ctx:       ctx,
+			ds:        ds,
+			version:   version,
+			timeField: timeField,
+			indices:   indices,
+			timeRange: timeRange,
+		}, nil
 	}
 
 	return nil, fmt.Errorf("elasticsearch version=%d is not supported", version)
@@ -93,6 +93,7 @@ type baseClientImpl struct {
 	version   int
 	timeField string
 	indices   []string
+	timeRange *tsdb.TimeRange
 }
 
 func (c *baseClientImpl) GetVersion() int {
@@ -114,11 +115,20 @@ func (c *baseClientImpl) getSettings() *simplejson.Json {
 }
 
 type multiRequest struct {
-	header map[string]interface{}
-	body   interface{}
+	header   map[string]interface{}
+	body     interface{}
+	interval tsdb.Interval
 }
 
 func (c *baseClientImpl) executeBatchRequest(uriPath string, requests []*multiRequest) (*http.Response, error) {
+	bytes, err := c.encodeBatchRequests(requests)
+	if err != nil {
+		return nil, err
+	}
+	return c.executeRequest(http.MethodPost, uriPath, bytes)
+}
+
+func (c *baseClientImpl) encodeBatchRequests(requests []*multiRequest) ([]byte, error) {
 	clientLog.Debug("Encoding batch requests to json", "batch requests", len(requests))
 	start := time.Now()
 
@@ -134,13 +144,18 @@ func (c *baseClientImpl) executeBatchRequest(uriPath string, requests []*multiRe
 		if err != nil {
 			return nil, err
 		}
-		payload.WriteString(string(reqBody) + "\n")
+
+		body := string(reqBody)
+		body = strings.Replace(body, "$__interval_ms", strconv.FormatInt(r.interval.Value.Nanoseconds()/int64(time.Millisecond), 10), -1)
+		body = strings.Replace(body, "$__interval", r.interval.Text, -1)
+
+		payload.WriteString(body + "\n")
 	}
 
 	elapsed := time.Now().Sub(start)
 	clientLog.Debug("Encoded batch requests to json", "took", elapsed)
 
-	return c.executeRequest(http.MethodPost, uriPath, payload.Bytes())
+	return payload.Bytes(), nil
 }
 
 func (c *baseClientImpl) executeRequest(method, uriPath string, body []byte) (*http.Response, error) {
@@ -173,7 +188,7 @@ func (c *baseClientImpl) executeRequest(method, uriPath string, body []byte) (*h
 		req.SetBasicAuth(c.ds.User, c.ds.Password)
 	}
 
-	httpClient, err := c.ds.GetHttpClient()
+	httpClient, err := newDatasourceHttpClient(c.ds)
 	if err != nil {
 		return nil, err
 	}
@@ -220,77 +235,26 @@ func (c *baseClientImpl) createMultiSearchRequests(searchRequests []*SearchReque
 	multiRequests := []*multiRequest{}
 
 	for _, searchReq := range searchRequests {
-		multiRequests = append(multiRequests, &multiRequest{
+		mr := multiRequest{
 			header: map[string]interface{}{
 				"search_type":        "query_then_fetch",
 				"ignore_unavailable": true,
 				"index":              strings.Join(c.indices, ","),
 			},
-			body: searchReq,
-		})
-	}
-
-	return multiRequests
-}
-
-type v2Client struct {
-	baseClient
-}
-
-func newV2Client(bc baseClient) (*v2Client, error) {
-	c := v2Client{
-		baseClient: bc,
-	}
-
-	return &c, nil
-}
-
-func (c *v2Client) createMultiSearchRequests(searchRequests []*SearchRequest) []*multiRequest {
-	multiRequests := c.baseClient.createMultiSearchRequests(searchRequests)
-
-	for _, mr := range multiRequests {
-		mr.header["search_type"] = "count"
-	}
-
-	return multiRequests
-}
-
-type v5Client struct {
-	baseClient
-}
-
-func newV5Client(bc baseClient) (*v5Client, error) {
-	c := v5Client{
-		baseClient: bc,
-	}
-
-	return &c, nil
-}
-
-type v56Client struct {
-	*v5Client
-	maxConcurrentShardRequests int
-}
-
-func newV56Client(bc baseClient) (*v56Client, error) {
-	v5Client := v5Client{
-		baseClient: bc,
-	}
-	maxConcurrentShardRequests := bc.getSettings().Get("maxConcurrentShardRequests").MustInt(256)
-
-	c := v56Client{
-		v5Client:                   &v5Client,
-		maxConcurrentShardRequests: maxConcurrentShardRequests,
-	}
+			body:     searchReq,
+			interval: searchReq.Interval,
+		}
 
-	return &c, nil
-}
+		if c.version == 2 {
+			mr.header["search_type"] = "count"
+		}
 
-func (c *v56Client) createMultiSearchRequests(searchRequests []*SearchRequest) []*multiRequest {
-	multiRequests := c.v5Client.createMultiSearchRequests(searchRequests)
+		if c.version >= 56 {
+			maxConcurrentShardRequests := c.getSettings().Get("maxConcurrentShardRequests").MustInt(256)
+			mr.header["max_concurrent_shard_requests"] = maxConcurrentShardRequests
+		}
 
-	for _, mr := range multiRequests {
-		mr.header["max_concurrent_shard_requests"] = c.maxConcurrentShardRequests
+		multiRequests = append(multiRequests, &mr)
 	}
 
 	return multiRequests

pkg/tsdb/elasticsearch/client/client_test.go

@@ -1,10 +1,17 @@
 package es
 
 import (
+	"bytes"
+	"context"
+	"fmt"
+	"io/ioutil"
 	"net/http"
+	"net/http/httptest"
 	"testing"
+	"time"
 
 	"github.com/grafana/grafana/pkg/components/simplejson"
+	"github.com/grafana/grafana/pkg/tsdb"
 
 	"github.com/grafana/grafana/pkg/models"
 	. "github.com/smartystreets/goconvey/convey"
@@ -85,131 +92,213 @@ func TestClient(t *testing.T) {
 			})
 		})
 
-		Convey("v2", func() {
-			ds := &models.DataSource{
-				JsonData: simplejson.NewFromAny(map[string]interface{}{
-					"esVersion": 2,
-				}),
+		Convey("Given a fake http client", func() {
+			var responseBuffer *bytes.Buffer
+			var req *http.Request
+			ts := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+				req = r
+				buf, err := ioutil.ReadAll(r.Body)
+				if err != nil {
+					t.Fatalf("Failed to read response body, err=%v", err)
+				}
+				responseBuffer = bytes.NewBuffer(buf)
+			}))
+
+			currentNewDatasourceHttpClient := newDatasourceHttpClient
+
+			newDatasourceHttpClient = func(ds *models.DataSource) (*http.Client, error) {
+				return ts.Client(), nil
 			}
 
-			c, err := newV2Client(newFakeBaseClient(ds, []string{"test-*"}))
-			So(err, ShouldBeNil)
-			So(c, ShouldNotBeNil)
+			from := time.Date(2018, 5, 15, 17, 50, 0, 0, time.UTC)
+			to := time.Date(2018, 5, 15, 17, 55, 0, 0, time.UTC)
+			fromStr := fmt.Sprintf("%d", from.UnixNano()/int64(time.Millisecond))
+			toStr := fmt.Sprintf("%d", to.UnixNano()/int64(time.Millisecond))
+			timeRange := tsdb.NewTimeRange(fromStr, toStr)
 
-			Convey("When creating multisearch requests should have correct headers", func() {
-				multiRequests := c.createMultiSearchRequests([]*SearchRequest{
-					{Index: "test-*"},
-				})
-				So(multiRequests, ShouldHaveLength, 1)
-				header := multiRequests[0].header
-				So(header, ShouldHaveLength, 3)
-				So(header["index"], ShouldEqual, "test-*")
-				So(header["ignore_unavailable"], ShouldEqual, true)
-				So(header["search_type"], ShouldEqual, "count")
-			})
-		})
+			Convey("and a v2.x client", func() {
+				ds := models.DataSource{
+					Database: "[metrics-]YYYY.MM.DD",
+					Url:      ts.URL,
+					JsonData: simplejson.NewFromAny(map[string]interface{}{
+						"esVersion": 2,
+						"timeField": "@timestamp",
+						"interval":  "Daily",
+					}),
+				}
 
-		Convey("v5", func() {
-			ds := &models.DataSource{
-				JsonData: simplejson.NewFromAny(map[string]interface{}{
-					"esVersion": 5,
-				}),
-			}
+				c, err := NewClient(context.Background(), &ds, timeRange)
+				So(err, ShouldBeNil)
+				So(c, ShouldNotBeNil)
 
-			c, err := newV5Client(newFakeBaseClient(ds, []string{"test-*"}))
-			So(err, ShouldBeNil)
-			So(c, ShouldNotBeNil)
+				Convey("When executing multi search", func() {
+					ms, err := createMultisearchForTest(c)
+					So(err, ShouldBeNil)
+					c.ExecuteMultisearch(ms)
 
-			Convey("When creating multisearch requests should have correct headers", func() {
-				multiRequests := c.createMultiSearchRequests([]*SearchRequest{
-					{Index: "test-*"},
+					Convey("Should send correct request and payload", func() {
+						So(req, ShouldNotBeNil)
+						So(req.Method, ShouldEqual, http.MethodPost)
+						So(req.URL.Path, ShouldEqual, "/_msearch")
+
+						So(responseBuffer, ShouldNotBeNil)
+
+						headerBytes, err := responseBuffer.ReadBytes('\n')
+						So(err, ShouldBeNil)
+						bodyBytes := responseBuffer.Bytes()
+
+						jHeader, err := simplejson.NewJson(headerBytes)
+						So(err, ShouldBeNil)
+
+						jBody, err := simplejson.NewJson(bodyBytes)
+						So(err, ShouldBeNil)
+
+						fmt.Println("body", string(headerBytes))
+
+						So(jHeader.Get("index").MustString(), ShouldEqual, "metrics-2018.05.15")
+						So(jHeader.Get("ignore_unavailable").MustBool(false), ShouldEqual, true)
+						So(jHeader.Get("search_type").MustString(), ShouldEqual, "count")
+						So(jHeader.Get("max_concurrent_shard_requests").MustInt(10), ShouldEqual, 10)
+
+						Convey("and replace $__interval variable", func() {
+							So(jBody.GetPath("aggs", "2", "aggs", "1", "avg", "script").MustString(), ShouldEqual, "15000*@hostname")
+						})
+
+						Convey("and replace $__interval_ms variable", func() {
+							So(jBody.GetPath("aggs", "2", "date_histogram", "interval").MustString(), ShouldEqual, "15s")
+						})
+					})
 				})
-				So(multiRequests, ShouldHaveLength, 1)
-				header := multiRequests[0].header
-				So(header, ShouldHaveLength, 3)
-				So(header["index"], ShouldEqual, "test-*")
-				So(header["ignore_unavailable"], ShouldEqual, true)
-				So(header["search_type"], ShouldEqual, "query_then_fetch")
 			})
-		})
 
-		Convey("v5.6", func() {
-			Convey("With default settings", func() {
+			Convey("and a v5.x client", func() {
 				ds := models.DataSource{
+					Database: "[metrics-]YYYY.MM.DD",
+					Url:      ts.URL,
 					JsonData: simplejson.NewFromAny(map[string]interface{}{
-						"esVersion": 56,
+						"esVersion":                  5,
+						"maxConcurrentShardRequests": 100,
+						"timeField":                  "@timestamp",
+						"interval":                   "Daily",
 					}),
 				}
 
-				c, err := newV56Client(newFakeBaseClient(&ds, []string{"test-*"}))
+				c, err := NewClient(context.Background(), &ds, timeRange)
 				So(err, ShouldBeNil)
 				So(c, ShouldNotBeNil)
 
-				Convey("When creating multisearch requests should have correct headers", func() {
-					multiRequests := c.createMultiSearchRequests([]*SearchRequest{
-						{Index: "test-*"},
+				Convey("When executing multi search", func() {
+					ms, err := createMultisearchForTest(c)
+					So(err, ShouldBeNil)
+					c.ExecuteMultisearch(ms)
+
+					Convey("Should send correct request and payload", func() {
+						So(req, ShouldNotBeNil)
+						So(req.Method, ShouldEqual, http.MethodPost)
+						So(req.URL.Path, ShouldEqual, "/_msearch")
+
+						So(responseBuffer, ShouldNotBeNil)
+
+						headerBytes, err := responseBuffer.ReadBytes('\n')
+						So(err, ShouldBeNil)
+						bodyBytes := responseBuffer.Bytes()
+
+						jHeader, err := simplejson.NewJson(headerBytes)
+						So(err, ShouldBeNil)
+
+						jBody, err := simplejson.NewJson(bodyBytes)
+						So(err, ShouldBeNil)
+
+						fmt.Println("body", string(headerBytes))
+
+						So(jHeader.Get("index").MustString(), ShouldEqual, "metrics-2018.05.15")
+						So(jHeader.Get("ignore_unavailable").MustBool(false), ShouldEqual, true)
+						So(jHeader.Get("search_type").MustString(), ShouldEqual, "query_then_fetch")
+						So(jHeader.Get("max_concurrent_shard_requests").MustInt(10), ShouldEqual, 10)
+
+						Convey("and replace $__interval variable", func() {
+							So(jBody.GetPath("aggs", "2", "aggs", "1", "avg", "script").MustString(), ShouldEqual, "15000*@hostname")
+						})
+
+						Convey("and replace $__interval_ms variable", func() {
+							So(jBody.GetPath("aggs", "2", "date_histogram", "interval").MustString(), ShouldEqual, "15s")
+						})
 					})
-					So(multiRequests, ShouldHaveLength, 1)
-					header := multiRequests[0].header
-					So(header, ShouldHaveLength, 4)
-					So(header["index"], ShouldEqual, "test-*")
-					So(header["ignore_unavailable"], ShouldEqual, true)
-					So(header["search_type"], ShouldEqual, "query_then_fetch")
-					So(header["max_concurrent_shard_requests"], ShouldEqual, 256)
 				})
 			})
 
-			Convey("With custom settings", func() {
+			Convey("and a v5.6 client", func() {
 				ds := models.DataSource{
+					Database: "[metrics-]YYYY.MM.DD",
+					Url:      ts.URL,
 					JsonData: simplejson.NewFromAny(map[string]interface{}{
 						"esVersion":                  56,
 						"maxConcurrentShardRequests": 100,
+						"timeField":                  "@timestamp",
+						"interval":                   "Daily",
 					}),
 				}
 
-				c, err := newV56Client(newFakeBaseClient(&ds, []string{"test-*"}))
+				c, err := NewClient(context.Background(), &ds, timeRange)
 				So(err, ShouldBeNil)
 				So(c, ShouldNotBeNil)
-				Convey("When creating multisearch requests should have correct headers", func() {
-					multiRequests := c.createMultiSearchRequests([]*SearchRequest{
-						{Index: "test-*"},
+
+				Convey("When executing multi search", func() {
+					ms, err := createMultisearchForTest(c)
+					So(err, ShouldBeNil)
+					c.ExecuteMultisearch(ms)
+
+					Convey("Should send correct request and payload", func() {
+						So(req, ShouldNotBeNil)
+						So(req.Method, ShouldEqual, http.MethodPost)
+						So(req.URL.Path, ShouldEqual, "/_msearch")
+
+						So(responseBuffer, ShouldNotBeNil)
+
+						headerBytes, err := responseBuffer.ReadBytes('\n')
+						So(err, ShouldBeNil)
+						bodyBytes := responseBuffer.Bytes()
+
+						jHeader, err := simplejson.NewJson(headerBytes)
+						So(err, ShouldBeNil)
+
+						jBody, err := simplejson.NewJson(bodyBytes)
+						So(err, ShouldBeNil)
+
+						fmt.Println("body", string(headerBytes))
+
+						So(jHeader.Get("index").MustString(), ShouldEqual, "metrics-2018.05.15")
+						So(jHeader.Get("ignore_unavailable").MustBool(false), ShouldEqual, true)
+						So(jHeader.Get("search_type").MustString(), ShouldEqual, "query_then_fetch")
+						So(jHeader.Get("max_concurrent_shard_requests").MustInt(), ShouldEqual, 100)
+
+						Convey("and replace $__interval variable", func() {
+							So(jBody.GetPath("aggs", "2", "aggs", "1", "avg", "script").MustString(), ShouldEqual, "15000*@hostname")
+						})
+
+						Convey("and replace $__interval_ms variable", func() {
+							So(jBody.GetPath("aggs", "2", "date_histogram", "interval").MustString(), ShouldEqual, "15s")
+						})
 					})
-					So(multiRequests, ShouldHaveLength, 1)
-					header := multiRequests[0].header
-					So(header, ShouldHaveLength, 4)
-					So(header["index"], ShouldEqual, "test-*")
-					So(header["ignore_unavailable"], ShouldEqual, true)
-					So(header["search_type"], ShouldEqual, "query_then_fetch")
-					So(header["max_concurrent_shard_requests"], ShouldEqual, 100)
 				})
 			})
+
+			Reset(func() {
+				newDatasourceHttpClient = currentNewDatasourceHttpClient
+			})
 		})
 	})
 }
 
-type fakeBaseClient struct {
-	*baseClientImpl
-	ds *models.DataSource
-}
-
-func newFakeBaseClient(ds *models.DataSource, indices []string) baseClient {
-	return &fakeBaseClient{
-		baseClientImpl: &baseClientImpl{
-			ds:      ds,
-			indices: indices,
-		},
-		ds: ds,
-	}
-}
-
-func (c *fakeBaseClient) executeBatchRequest(uriPath string, requests []*multiRequest) (*http.Response, error) {
-	return nil, nil
-}
+func createMultisearchForTest(c Client) (*MultiSearchRequest, error) {
+	msb := c.MultiSearch()
+	s := msb.Search(tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
+	s.Agg().DateHistogram("2", "@timestamp", func(a *DateHistogramAgg, ab AggBuilder) {
+		a.Interval = "$__interval"
 
-func (c *fakeBaseClient) executeRequest(method, uriPath string, body []byte) (*http.Response, error) {
-	return nil, nil
-}
-
-func (c *fakeBaseClient) executeMultisearch(searchRequests []*SearchRequest) ([]*SearchResponse, error) {
-	return nil, nil
+		ab.Metric("1", "avg", "@hostname", func(a *MetricAggregation) {
+			a.Settings["script"] = "$__interval_ms*@hostname"
+		})
+	})
+	return msb.Build()
 }

pkg/tsdb/elasticsearch/client/models.go

@@ -2,11 +2,14 @@ package es
 
 import (
 	"encoding/json"
+
+	"github.com/grafana/grafana/pkg/tsdb"
 )
 
 // SearchRequest represents a search request
 type SearchRequest struct {
 	Index       string
+	Interval    tsdb.Interval
 	Size        int
 	Sort        map[string]interface{}
 	Query       *Query

pkg/tsdb/elasticsearch/client/search_request.go

@@ -2,11 +2,14 @@ package es
 
 import (
 	"strings"
+
+	"github.com/grafana/grafana/pkg/tsdb"
 )
 
 // SearchRequestBuilder represents a builder which can build a search request
 type SearchRequestBuilder struct {
 	version      int
+	interval     tsdb.Interval
 	index        string
 	size         int
 	sort         map[string]interface{}
@@ -16,9 +19,10 @@ type SearchRequestBuilder struct {
 }
 
 // NewSearchRequestBuilder create a new search request builder
-func NewSearchRequestBuilder(version int) *SearchRequestBuilder {
+func NewSearchRequestBuilder(version int, interval tsdb.Interval) *SearchRequestBuilder {
 	builder := &SearchRequestBuilder{
 		version:     version,
+		interval:    interval,
 		sort:        make(map[string]interface{}),
 		customProps: make(map[string]interface{}),
 		aggBuilders: make([]AggBuilder, 0),
@@ -30,6 +34,7 @@ func NewSearchRequestBuilder(version int) *SearchRequestBuilder {
 func (b *SearchRequestBuilder) Build() (*SearchRequest, error) {
 	sr := SearchRequest{
 		Index:       b.index,
+		Interval:    b.interval,
 		Size:        b.size,
 		Sort:        b.sort,
 		CustomProps: b.customProps,
@@ -128,8 +133,8 @@ func NewMultiSearchRequestBuilder(version int) *MultiSearchRequestBuilder {
 }
 
 // Search initiates and returns a new search request builder
-func (m *MultiSearchRequestBuilder) Search() *SearchRequestBuilder {
-	b := NewSearchRequestBuilder(m.version)
+func (m *MultiSearchRequestBuilder) Search(interval tsdb.Interval) *SearchRequestBuilder {
+	b := NewSearchRequestBuilder(m.version, interval)
 	m.requestBuilders = append(m.requestBuilders, b)
 	return b
 }

pkg/tsdb/elasticsearch/client/search_request_test.go

@@ -3,8 +3,10 @@ package es
 import (
 	"encoding/json"
 	"testing"
+	"time"
 
 	"github.com/grafana/grafana/pkg/components/simplejson"
+	"github.com/grafana/grafana/pkg/tsdb"
 
 	. "github.com/smartystreets/goconvey/convey"
 )
@@ -13,7 +15,7 @@ func TestSearchRequest(t *testing.T) {
 	Convey("Test elasticsearch search request", t, func() {
 		timeField := "@timestamp"
 		Convey("Given new search request builder for es version 5", func() {
-			b := NewSearchRequestBuilder(5)
+			b := NewSearchRequestBuilder(5, tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
 
 			Convey("When building search request", func() {
 				sr, err := b.Build()
@@ -388,7 +390,7 @@ func TestSearchRequest(t *testing.T) {
 		})
 
 		Convey("Given new search request builder for es version 2", func() {
-			b := NewSearchRequestBuilder(2)
+			b := NewSearchRequestBuilder(2, tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
 
 			Convey("When adding doc value field", func() {
 				b.AddDocValueField(timeField)
@@ -447,7 +449,7 @@ func TestMultiSearchRequest(t *testing.T) {
 			b := NewMultiSearchRequestBuilder(0)
 
 			Convey("When adding one search request", func() {
-				b.Search()
+				b.Search(tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
 
 				Convey("When building search request should contain one search request", func() {
 					mr, err := b.Build()
@@ -457,8 +459,8 @@ func TestMultiSearchRequest(t *testing.T) {
 			})
 
 			Convey("When adding two search requests", func() {
-				b.Search()
-				b.Search()
+				b.Search(tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
+				b.Search(tsdb.Interval{Value: 15 * time.Second, Text: "15s"})
 
 				Convey("When building search request should contain two search requests", func() {
 					mr, err := b.Build()

pkg/tsdb/elasticsearch/time_series_query.go

@@ -3,8 +3,6 @@ package elasticsearch
 import (
 	"fmt"
 	"strconv"
-	"strings"
-	"time"
 
 	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/tsdb"
@@ -47,7 +45,7 @@ func (e *timeSeriesQuery) execute() (*tsdb.Response, error) {
 		}
 		interval := e.intervalCalculator.Calculate(e.tsdbQuery.TimeRange, minInterval)
 
-		b := ms.Search()
+		b := ms.Search(interval)
 		b.Size(0)
 		filters := b.Query().Bool().Filter()
 		filters.AddDateRangeFilter(e.client.GetTimeField(), to, from, es.DateFormatEpochMS)
@@ -78,7 +76,7 @@ func (e *timeSeriesQuery) execute() (*tsdb.Response, error) {
 		for _, bucketAgg := range q.BucketAggs {
 			switch bucketAgg.Type {
 			case "date_histogram":
-				aggBuilder = addDateHistogramAgg(aggBuilder, bucketAgg, from, to, interval)
+				aggBuilder = addDateHistogramAgg(aggBuilder, bucketAgg, from, to)
 			case "histogram":
 				aggBuilder = addHistogramAgg(aggBuilder, bucketAgg)
 			case "filters":
@@ -125,7 +123,7 @@ func (e *timeSeriesQuery) execute() (*tsdb.Response, error) {
 	return rp.getTimeSeries()
 }
 
-func addDateHistogramAgg(aggBuilder es.AggBuilder, bucketAgg *BucketAgg, timeFrom, timeTo string, interval tsdb.Interval) es.AggBuilder {
+func addDateHistogramAgg(aggBuilder es.AggBuilder, bucketAgg *BucketAgg, timeFrom, timeTo string) es.AggBuilder {
 	aggBuilder.DateHistogram(bucketAgg.ID, bucketAgg.Field, func(a *es.DateHistogramAgg, b es.AggBuilder) {
 		a.Interval = bucketAgg.Settings.Get("interval").MustString("auto")
 		a.MinDocCount = bucketAgg.Settings.Get("min_doc_count").MustInt(0)
@@ -136,10 +134,6 @@ func addDateHistogramAgg(aggBuilder es.AggBuilder, bucketAgg *BucketAgg, timeFro
 			a.Interval = "$__interval"
 		}
 
-		a.Interval = strings.Replace(a.Interval, "$interval", interval.Text, -1)
-		a.Interval = strings.Replace(a.Interval, "$__interval_ms", strconv.FormatInt(interval.Value.Nanoseconds()/int64(time.Millisecond), 10), -1)
-		a.Interval = strings.Replace(a.Interval, "$__interval", interval.Text, -1)
-
 		if missing, err := bucketAgg.Settings.Get("missing").String(); err == nil {
 			a.Missing = &missing
 		}

pkg/tsdb/elasticsearch/time_series_query_test.go

@@ -268,7 +268,7 @@ func TestExecuteTimeSeriesQuery(t *testing.T) {
 			So(firstLevel.Aggregation.Type, ShouldEqual, "date_histogram")
 			hAgg := firstLevel.Aggregation.Aggregation.(*es.DateHistogramAgg)
 			So(hAgg.Field, ShouldEqual, "@timestamp")
-			So(hAgg.Interval, ShouldEqual, "15s")
+			So(hAgg.Interval, ShouldEqual, "$__interval")
 			So(hAgg.MinDocCount, ShouldEqual, 2)
 		})