[Monitoring] Use index.auto_expand_replicas: 0-1 (elastic/x-pack-elasticsearch#3282)

This changes the default behavior of .monitoring indices to be green on one-node clusters, instead of constantly yellow.

Note: This only impacts .monitoring* indices. Watcher indices currently still require a replica.

Original commit: elastic/x-pack-elasticsearch@6eb8a48a9f

plugin/src/main/resources/monitoring-alerts.json

@@ -4,7 +4,8 @@
   "settings": {
     "index": {
       "number_of_shards": 1,
-      "number_of_replicas": 1,
+      "number_of_replicas": 0,
+      "auto_expand_replicas": "0-1",
       "format": 6,
       "codec": "best_compression"
     }

plugin/src/main/resources/monitoring-beats.json

@@ -3,7 +3,8 @@
   "version": 7000001,
   "settings": {
     "index.number_of_shards": 1,
-    "index.number_of_replicas": 1,
+    "index.number_of_replicas": 0,
+    "index.auto_expand_replicas": "0-1",
     "index.format": 6,
     "index.codec": "best_compression"
   },

plugin/src/main/resources/monitoring-es.json

@@ -3,7 +3,8 @@
   "version": 7000001,
   "settings": {
     "index.number_of_shards": 1,
-    "index.number_of_replicas": 1,
+    "index.number_of_replicas": 0,
+    "index.auto_expand_replicas": "0-1",
     "index.format": 6,
     "index.codec": "best_compression"
   },

plugin/src/main/resources/monitoring-kibana.json

@@ -3,7 +3,8 @@
   "version": 7000001,
   "settings": {
     "index.number_of_shards": 1,
-    "index.number_of_replicas": 1,
+    "index.number_of_replicas": 0,
+    "index.auto_expand_replicas": "0-1",
     "index.format": 6,
     "index.codec": "best_compression"
   },

plugin/src/main/resources/monitoring-logstash.json

@@ -3,7 +3,8 @@
   "version": 7000001,
   "settings": {
     "index.number_of_shards": 1,
-    "index.number_of_replicas": 1,
+    "index.number_of_replicas": 0,
+    "index.auto_expand_replicas": "0-1",
     "index.format": 6,
     "index.codec": "best_compression"
   },