Github user xristy commented on the issue:
https://github.com/apache/jena/pull/335
Ah! I should have written on this.
Upgrading to this PR does not affect an existing text index.
The changes to the Lucene documents that are indexed will affect triples
that are added - they will have fewer fields and if the graph field is enabled
then a single stored graph field will be present rather than several instances.
This PR removes redundant fields or unreferenced fields when indexing new
triple documents.
The triple/document deletion functionality will behave as before if it was
enabled when the text index was created.
The graph return feature will function with older indexes provided that the
graph field was enabled when the text index was created.
Re-indexing should generally reduce the size of the text index.
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