Refactor ILM collector

Consolidate the ILM collector logic into a single collector using the new Collector interface

Signed-off-by: Joe Adams <github@joeadams.io>

Author: sysadmind

collector/ilm.go

@@ -34,7 +34,7 @@ var (
 
 	ilmStatus = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, "ilm", "status"),
-		"Current status of ilm. Status can be STOPPED, RUNNING, STOPPING.",
+		"Current status of ILM. Status can be STOPPED, RUNNING, STOPPING.",
 		[]string{"operation_mode"}, nil,
 	)
 )

collector/ilm_test.go

@@ -41,7 +41,7 @@ func TestILM(t *testing.T) {
 						# TYPE elasticsearch_ilm_index_status gauge
 						elasticsearch_ilm_index_status{action="",index="twitter",phase="",step=""} 0
 						elasticsearch_ilm_index_status{action="complete",index="facebook",phase="new",step="complete"} 1
-						# HELP elasticsearch_ilm_status Current status of ilm. Status can be STOPPED, RUNNING, STOPPING.
+						# HELP elasticsearch_ilm_status Current status of ILM. Status can be STOPPED, RUNNING, STOPPING.
             # TYPE elasticsearch_ilm_status gauge
             elasticsearch_ilm_status{operation_mode="RUNNING"} 1
             elasticsearch_ilm_status{operation_mode="STOPPED"} 0