Re: [PR] SOLR-17888: Upgrade Apache Tika to 3.2.3 [solr]

["janhoy (via GitHub)" <gi...@apache.org>]

janhoy commented on PR #3674:
URL: https://github.com/apache/solr/pull/3674#issuecomment-3480639957

   > The PR introduces breaking changes (therefore backporting should probably be avoided). Apache Tika 2 and 3 standardized the metadata fields, which affect the returned fields.
   
   I tackled that in the `tikaserver` backend by adding a Metadata mapper that, if enabled, will map from e.g. `dc.author` to `Author` to please what users might have come to expect in Tika1.x. If you intend to pursue some upgrade in the 9.x line, re-using that class could perhaps make the upgrade somewhat more compatible. But if it is compatible enough to warrant this breaking change in 9.x I don't know.
   
   I'd not be opposed to announce that a "necessary" breaking change will happen in, say 9.11, due to security risks, and then prepare users for the change. I kept the mapping option hidden, un-documented, since I don't want us to have to support it. But one could offer a user-supplied map `{"from": "to", "from2", "to2"}` where she could tailor this. Or, perhaps that would not be needed since we already have the fmap feature able to map fields, e.g. `fmap.dc.author=Author`.


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