For those using SolrCloud, you can read this in the upgrade notes: https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html <https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html>
"If using CloudSolrClient to connect to your SolrCloud cluster, SolrJ must be upgraded in all your client applications to version 8.10 or higher (8.x), before upgrading your SolrCloud cluster to version 9.0. Otherwise, SolrJ will not be able to connect to the cluster once it has upgraded to Solr 9." Jan > 31. mai 2022 kl. 11:37 skrev Gohlke, Alexander <[email protected]>: > > Hello, > > I am looking for information which version of the SolrJ client is compatible > with the Solr server. So far I only found some information in the cwiki where > it says: "SolrJ generally maintains backwards compatibility, so you can use a > newer SolrJ with an older Solr, or an older SolrJ with a newer Solr". > However, this wiki is a bit older and I can't evaluate if this is also true > for Solr 8.11.x and 9.0.0. > https://cwiki.apache.org/confluence/display/solr/Solrj > > Background is the following. I have a legacy application using SolrJ 4.10.4 > with Solr server 7.7.3. So far this works without any problems. Now the Solr > server needs to be updated to 8.11.1 or 9. Unfortunately updating the SolrJ > version is not possible due to the dependency situation. > > Is SolrJ client in version 4.10.4 is compatible with a Solr server 8.11.1 or > 9.0.0 ? Any information would be very appreciated. > > Best regards to all > Alex >
