David Turner 4c909e93bb
Reject port ranges in discovery.seed_hosts (#41905)
Today Elasticsearch accepts, but silently ignores, port ranges in the
`discovery.seed_hosts` setting:

```
discovery.seed_hosts: 10.1.2.3:9300-9400
```

Silently ignoring part of a setting like this is trappy. With this change we
reject seed host addresses of this form.

Closes #40786
Backport of #41404
2019-05-08 08:34:32 +01:00
..