Update Nodes Stats API to latest API

This commit brings the Nodes Stats API to the latest version.

Notice that 7.15.0 has a
elastic/elasticsearch#78311 that is likely
being fixed by elastic/elasticsearch#78531, so
we're skipping the given test for that specific release.

Once 7.15.1 is released, the bug might reappear unless the PR is being
merged into that version.

See #1535

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:${VERSION:-7.14.2}
+    image: docker.elastic.co/elasticsearch/elasticsearch:${VERSION:-7.15.0}
     hostname: elasticsearch
     environment:
       - cluster.name=elasticsearch
@@ -28,7 +28,7 @@ services:
     ports:
       - 9200:9200
   platinum:
-    image: docker.elastic.co/elasticsearch/elasticsearch:${VERSION:-7.14.2}
+    image: docker.elastic.co/elasticsearch/elasticsearch:${VERSION:-7.15.0}
     hostname: elasticsearch-platinum
     environment:
       - cluster.name=platinum

nodes_stats.go

@@ -333,6 +333,7 @@ type NodesStatsNode struct {
 
 type NodesStatsIndex struct {
 	Docs         *NodesStatsDocsStats         `json:"docs"`
+	Shards       *NodesStatsShardCountStats   `json:"shards_stats"`
 	Store        *NodesStatsStoreStats        `json:"store"`
 	Indexing     *NodesStatsIndexingStats     `json:"indexing"`
 	Get          *NodesStatsGetStats          `json:"get"`
@@ -343,23 +344,25 @@ type NodesStatsIndex struct {
 	Warmer       *NodesStatsWarmerStats       `json:"warmer"`
 	QueryCache   *NodesStatsQueryCacheStats   `json:"query_cache"`
 	Fielddata    *NodesStatsFielddataStats    `json:"fielddata"`
-	Percolate    *NodesStatsPercolateStats    `json:"percolate"`
 	Completion   *NodesStatsCompletionStats   `json:"completion"`
 	Segments     *NodesStatsSegmentsStats     `json:"segments"`
 	Translog     *NodesStatsTranslogStats     `json:"translog"`
-	Suggest      *NodesStatsSuggestStats      `json:"suggest"`
 	RequestCache *NodesStatsRequestCacheStats `json:"request_cache"`
 	Recovery     NodesStatsRecoveryStats      `json:"recovery"`
 
-	Indices map[string]*NodesStatsIndex `json:"indices"` // for level=indices
-	Shards  map[string]*NodesStatsIndex `json:"shards"`  // for level=shards
+	IndicesLevel map[string]*NodesStatsIndex `json:"indices"` // for level=indices
+	ShardsLevel  map[string]*NodesStatsIndex `json:"shards"`  // for level=shards
 }
 
 type NodesStatsDocsStats struct {
 	Count   int64 `json:"count"`
 	Deleted int64 `json:"deleted"`
 }
 
+type NodesStatsShardCountStats struct {
+	TotalCount int64 `json:"total_count"`
+}
+
 type NodesStatsStoreStats struct {
 	Size        string `json:"size"`
 	SizeInBytes int64  `json:"size_in_bytes"`
@@ -473,16 +476,6 @@ type NodesStatsFielddataStats struct {
 	} `json:"fields"`
 }
 
-type NodesStatsPercolateStats struct {
-	Total             int64  `json:"total"`
-	Time              string `json:"time"`
-	TimeInMillis      int64  `json:"time_in_millis"`
-	Current           int64  `json:"current"`
-	MemorySize        string `json:"memory_size"`
-	MemorySizeInBytes int64  `json:"memory_size_in_bytes"`
-	Queries           int64  `json:"queries"`
-}
-
 type NodesStatsCompletionStats struct {
 	Size        string `json:"size"`
 	SizeInBytes int64  `json:"size_in_bytes"`
@@ -522,13 +515,6 @@ type NodesStatsTranslogStats struct {
 	SizeInBytes int64  `json:"size_in_bytes"`
 }
 
-type NodesStatsSuggestStats struct {
-	Total             int64  `json:"total"`
-	TotalTime         string `json:"total_time"`
-	TotalTimeInMillis int64  `json:"total_time_in_millis"`
-	Current           int64  `json:"current"`
-}
-
 type NodesStatsRequestCacheStats struct {
 	MemorySize        string `json:"memory_size"`
 	MemorySizeInBytes int64  `json:"memory_size_in_bytes"`

nodes_stats_test.go

@@ -6,16 +6,28 @@ package elastic
 
 import (
 	"context"
+	"log"
+	"os"
 	"testing"
 )
 
 func TestNodesStats(t *testing.T) {
-	client, err := NewClient()
+	client, err := NewClient(SetTraceLog(log.New(os.Stdout, "", 0)))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// TODO(oe) Remove this hack after a fix for https://github.com/elastic/elasticsearch/issues/78311 is released
+	version, err := client.ElasticsearchVersion(DefaultURL)
 	if err != nil {
 		t.Fatal(err)
 	}
+	if version == "7.15.0" {
+		t.Skip("skipping NodesStats test for 7.15.0 because of https://github.com/elastic/elasticsearch/issues/78311")
+		return
+	}
 
-	info, err := client.NodesStats().Human(true).Do(context.TODO())
+	info, err := client.NodesStats().Human(true).Pretty(true).Do(context.TODO())
 	if err != nil {
 		t.Fatal(err)
 	}