Something else I've done is write java code, compiled against the lucene libraries matching the data, to read the lucene indexes and write them in json. I used this to reindex collections into a 9.6 solr from backups taken from 8.x solr. ________________________________ From: Rahul Goswami <rahul196...@gmail.com> Sent: Wednesday, July 16, 2025 5:03 PM To: users@solr.apache.org <users@solr.apache.org> Cc: solr-u...@lucene.apache.org <solr-u...@lucene.apache.org> Subject: Re: Restore the collection in solr 9.6.1 version where Backup is done in solr 7.2.1 version
Solr 9. x will not open any indexes touched by <= Solr 7. x. So you might be out of luck with restoring the backed up index. This version limitation comes from the Lucene layer which powers the index capabilities of Solr. If access to the data ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Solr 9.x will not open any indexes touched by <= Solr 7.x. So you might be out of luck with restoring the backed up index. This version limitation comes from the Lucene layer which powers the index capabilities of Solr. If access to the data is crucial, you could try restoring the index on a Solr 8.x setup instead if that's an option. This is because a Lucene index created in version x can be read by (up to) version x+1. -Rahul On Wed, Jul 16, 2025 at 3:59 AM Sathish Ponnusamy <sathishrp...@gmail.com> wrote: > Hi Team, > > Is it possible to restore the collection in solr 9.6.1 where backup is done > in 7.2.1 solr version? > > Infra wise below are config: > > Solr-7.2.1 is setup in aws EC2 & backup is done in EFS > > Solr 9.6.1 setup is done in GCP VM and back up solution is GCS > > > > Sathish Ponnusamy > > Chennai > m: + 91 9962331981 > e: sathishrp...@gmail.com > > GitHub - github.com/sathishrpt24 > <https://urldefense.us/v3/__http://github*20-*20github.com/sathishrpt24__;JSU!!G_uCfscf7eWS!YrI8aZ9fGvHLYMpaUYwB17YHc4Wbx1WBuCCUUF-Wx3t7cYF9cOkTbnC1aOUyLlGeRCCBvziNNxKUo9_5Gl9RVA$> > [image: Youtbue icon] > <https://urldefense.us/v3/__https://www.youtube.com/channel/UCyPZ_DNpq2zOsTW9Txod4tg__;!!G_uCfscf7eWS!YrI8aZ9fGvHLYMpaUYwB17YHc4Wbx1WBuCCUUF-Wx3t7cYF9cOkTbnC1aOUyLlGeRCCBvziNNxKUo98rdPzYyQ$> >
