Magnolia 6.0 reached end of life on June 26, 2019. This branch is no longer supported, see End-of-life policy.
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Jackrabbit 2.16 introduced existence checks for node-types when refreshing indexing configurations. Previously it would accept arbitrary node-type names as strings. If your project is not using Magnolia's SearchIndex implementation, you may find the following messages in your logs:
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