Github user dsmiley commented on a diff in the pull request: https://github.com/apache/lucene-solr/pull/433#discussion_r208716790 --- Diff: solr/core/src/java/org/apache/solr/cloud/api/collections/TimeRoutedAlias.java --- @@ -141,6 +145,9 @@ public TimeRoutedAlias(String aliasName, Map<String, String> aliasMetadata) { //optional: maxFutureMs = params.getLong(ROUTER_MAX_FUTURE, TimeUnit.MINUTES.toMillis(10)); + // the date math configured is an interval to be subtracted from the most recent collection's time stamp + preemptiveCreateMath = params.get(ROUTER_PREEMPTIVE_CREATE_MATH) != null ? --- End diff -- Perhaps this should detect if it already starts with a plus or minus and if so removes it, thus making it more friendly to people who like to include the operator?
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