Use `expand_wildcards` to limit bad API responses

Certain API calls will fail if there are closed indices in the cluster, such as `_nodes/stats`. When there is a closed index it will respond with:

```
Bad Request. Rejected
{
"error" : {
"root_cause" : [
{
"type" : "index_closed_exception",
"reason" : "closed",
"index_uuid" : "LEF6dp1xTC2dkNCEMRtUUQ",
"index" : "syslog"
}
],
"type" : "index_closed_exception",
"reason" : "closed",
"index_uuid" : "LEF6dp1xTC2dkNCEMRtUUQ",
"index" : "syslog"
},
"status" : 400
}
```

The multi-target syntax allows adding `?expand_wildcards=open` as far back as 6.8:
https://www.elastic.co/guide/en/elasticsearch/reference/6.8/multi-index.html

With additional `?expand_wildcards=open,hidden` options in 7.x:
https://www.elastic.co/guide/en/elasticsearch/reference/7.17/multi-index.html

If we add this to the API calls we can hopefully prevent parsing failures when trying to run the diagnostic through the analyzer.