This section describes changes that are required if you are trying to change your 4.26 plug-in to adopt the 4.27 mechanisms and APIs.
What is affected: Clients supplying pre-built Lucene help indexes.
Description: We have updated the Apache Lucene search engine to Lucene 9.4.2. This means that the indexes built with older versions will not be readable anymore. See Lucene Change Log for details.
Action required: Clients should: