What ended up making the search work from python was to explicitly add "RequestTime" to the regex. For some reason it worked without it on the web UI. rex field=_raw ".*?\\t.*?\\t.*?\\t.*?\t(?<Method>\w+)\s/(?<URI>.+?)\sHTTP.+?\\t.*?\\t(?<Status>.+?)\\t.*?\\t.*?\\t.*?\\t.*?\\t(?<RequestTime>.+?)\s"
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