[Watcher] Use auto_expand_replicas on triggered_watches index too (elastic/x-pack-elasticsearch#3371)
In the previous pass, only the ".watch*" templates were impacted. This also should use `auto_expand_replicas`.
Original commit: elastic/x-pack-elasticsearch@bcaad6cf2ef3610d79f7ae1cb453b1d849779f2d
"order": 2147483647,
"settings": {
"index.number_of_shards": 1,
+ "index.auto_expand_replicas": "0-1",
"index.refresh_interval" : "-1",
"index.format": 6,
"index.priority": 900
