I upgraded my drupal apachesolr search module from 1.8 to 1.11 and I also upgrade the apachesolr version from version 4.10 to 5.5, and managed to upgrade the index folder so that it can be used for 5.5 solr search. But once I change the drupal apache solr URL to connect to the new 5.5 solr search, it ask me to reindex everything again. Is there a way to avoid this step?

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    No, you updated a major version of solr. I'd expect a good deal of change in the conf files and especially if you had to make a new core - you will need to reindex. – Kevin Jan 18 '19 at 14:57
  • no not new core. it is using existing core with upgraded index. It works on the solr web admin but not on drupal – Moses Liao GZ Jan 20 '19 at 2:38

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