Exporting an index to a consumable binary and splitting the indexes is not a trivial process, so it is not configured to allow publishing every time a release or snapshot is published. This is also a waste, as it is unlikely that index consumers are updated every n seconds.
Internal indexes, however, are updated in real time, and searches with the Nexus interface will have the latest and largest. We are working on a tighter integration of IDE and Nexus internal indexes to eliminate the publishing / consumption cycle.
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