Align Logstash bracket field syntax with Logstash #143
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Align bracket field regex with:
https://www.elastic.co/guide/en/logstash/current/field-references-deepdive.html#formal-grammar-field-name
https://github.com/elastic/logstash/blob/c698aa224b44c7356fbfeb58ebb0c4a66d72dc71/logstash-core/lib/logstash/config/grammar.treetop#L236
Fixes: #142