5fb59f36a0
## Summary
* Simple small bug fix so that the `signalsIndex` works again.
Without this any developer starting up Kibana with their `xpack.siem.signalsIndex` set will get a quick crash.
Test:
Add this key to your `kibana.dev.yml`
```sh
xpack.siem.signalsIndex: .siem-signals-your-name
```
Ensure it starts up without crashing. Take the key out, ensure it starts up without crashing.
In the folder:
```sh
detection_engine/scripts
```
You can run this and get back the index you expect which is whatever you set the key to and the space you're in:
```sh
./get_signal_index.sh
{
"name": ".siem-signals-your-name-default"
}
```
### Checklist
Use ~~strikethroughs~~ to remove checklist items you don't feel are applicable to this PR.
~~- [ ] This was checked for cross-browser compatibility, [including a check against IE11](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility)~~
~~- [ ] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/master/packages/kbn-i18n/README.md)~~
~~- [ ] [Documentation](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#writing-documentation) was added for features that require explanation or tutorials~~
~~- [ ] [Unit or functional tests](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility) were updated or added to match the most common scenarios~~
~~- [ ] This was checked for [keyboard-only and screenreader accessibility](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility#Accessibility_testing_checklist)~~
### For maintainers
~~- [ ] This was checked for breaking API changes and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)~~
- [x] This includes a feature addition or change that requires a release note and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)
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