The start parameter (for Time Routed Aliases and 2-Dimensional Routed Aliases using time components) is meant to accept date math as well as a timestamp. However it seems that none of the tests actually test this, and my changes for DRA forgot to account for it in one place, so an exception is thrown adding a document to an alias with such a configuration. Will add a test and a fix.
SOLR-13943 TimeRoutedAliasUpdateProcessorTest.testDateMathInStart: multi-threaded race condition due to ZK assumptions
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