Merge from yelp/elastalert:master to ensure parity #2
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This has come about because we currently use records which have timestamps like:
```
"@timestamp": {
"min": "2020-10-03T07:05:01.987Z",
"max": "2020-10-05T07:05:09.572Z"
},
```
These work fine with the `timestamp_field` set to `@timestamp.min`.
However, when we try to create a Jira alert using ElastAlert from these, we run
into a Python error:
```
File "/usr/local/lib/python3.6/site-packages/elastalert/alerts.py", line 875, in create_default_title,
title += ' - %s' % (pretty_ts(matches[0][self.rule['timestamp_field']], self.rule.get('use_local_time'))), KeyError: '@timestamp.min'
```
This is because matches[0][self.rule['timestamp_field']] attempts to access
the `timestamp_field` directly rather than using a `get()`.
The proposed fix will not change any existing behaviour, but will skip the addition
of a timestamp to the ticket title if the required field doesn't exist, rather than
throwing an error and disabling the rule.
Fix the use of timestamps in the Jira ticket titles
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