Implement os stats.

plugins/elasticsearch/elasticsearch.go

@@ -16,6 +16,7 @@ type node struct {
 	Name       string            `json:"name"`
 	Attributes map[string]string `json:"attributes"`
 	Indices    interface{}       `json:"indices"`
+	Os         interface{}       `json:"os"`
 }
 
 const sampleConfig = `
@@ -99,6 +100,9 @@ func (e *Elasticsearch) gatherUrl(url string, acc plugins.Accumulator) error {
 		if err := e.parseInterface(acc, "indices", tags, n.Indices); err != nil {
 			return err
 		}
+		if err := e.parseInterface(acc, "os", tags, n.Os); err != nil {
+			return err
+		}
 	}
 
 	return nil
@@ -114,8 +118,8 @@ func (e *Elasticsearch) parseInterface(acc plugins.Accumulator, prefix string, t
 		}
 	case float64:
 		acc.Add(prefix, t, tags)
-	case bool, string:
-		// ignored bool and string
+	case bool, string, []interface{}:
+		// ignored types
 		return nil
 	default:
 		return fmt.Errorf("elasticsearch: got unexpected type %T with value %v (%s)", t, t, prefix)

plugins/elasticsearch/elasticsearch_test.go

@@ -54,4 +54,8 @@ func TestElasticsearch(t *testing.T) {
 	for key, val := range indicesExpected {
 		assert.NoError(t, acc.ValidateTaggedValue(key, val, tags))
 	}
+
+	for key, val := range osExpected {
+		assert.NoError(t, acc.ValidateTaggedValue(key, val, tags))
+	}
 }

plugins/elasticsearch/testdata_test.go

@@ -126,6 +126,34 @@ const statsResponse = `
           "current_as_target": 0,
           "throttle_time_in_millis": 0
         }
+      },
+      "os": {
+        "timestamp": 1436460392944,
+        "uptime_in_millis": 25092,
+        "load_average": [
+          0.01,
+          0.04,
+          0.05
+        ],
+        "cpu": {
+          "sys": 0,
+          "user": 0,
+          "idle": 99,
+          "usage": 0,
+          "stolen": 0
+        },
+        "mem": {
+          "free_in_bytes": 477761536,
+          "used_in_bytes": 1621868544,
+          "free_percent": 74,
+          "used_percent": 25,
+          "actual_free_in_bytes": 1565470720,
+          "actual_used_in_bytes": 534159360
+        },
+        "swap": {
+          "used_in_bytes": 0,
+          "free_in_bytes": 487997440
+        }
       }
     }
   }
@@ -203,3 +231,21 @@ var indicesExpected = map[string]float64{
 	"indices_segments_version_map_memory_in_bytes":      611844,
 	"indices_segments_fixed_bit_set_memory_in_bytes":    0,
 }
+
+var osExpected = map[string]float64{
+	"os_swap_used_in_bytes":       0,
+	"os_swap_free_in_bytes":       487997440,
+	"os_timestamp":                1436460392944,
+	"os_uptime_in_millis":         25092,
+	"os_cpu_sys":                  0,
+	"os_cpu_user":                 0,
+	"os_cpu_idle":                 99,
+	"os_cpu_usage":                0,
+	"os_cpu_stolen":               0,
+	"os_mem_free_percent":         74,
+	"os_mem_used_percent":         25,
+	"os_mem_actual_free_in_bytes": 1565470720,
+	"os_mem_actual_used_in_bytes": 534159360,
+	"os_mem_free_in_bytes":        477761536,
+	"os_mem_used_in_bytes":        1621868544,
+}