07/20/20 00:48:28 INFO hello 353 us.(channel/Channel.cpp:575)
07/20/20 00:48:28 INFO transfercity:bj(city/cityTransferQueryBusiness.cpp:72)
07/20/20 00:48:29 INFO transferQuery city 965380 us.(channel/Channel.cpp:575)
That should get you an ambiguous reference error and logstash will likely fail to start. It should be %{[useinfo][0]}, although I do not see where you are actually doing a split on useinfo.
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