Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/1055
FYI - There is also another `source.type.field` reference that would be an
easy update
[here](https://github.com/apache/metron/blob/71a015fabc47b23ea0c5400fa239fee9f5c0d194/metron-interface/metron-rest/src/test/java/org/apache/metron/rest/service/impl/SearchServiceImplTest.java#L186)
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