If I were you, I would think about this as “a fresh implementation inspired by my old set up”…. So much has changed/evolved/gotten better. I would start out with a fresh 9.x Setup, and then look at your old setup and compare differences….
> On Feb 15, 2023, at 7:11 PM, Shawn Heisey <apa...@elyograg.org> wrote: > > On 2/14/23 20:02, Natarajan, Rajeswari wrote: >> Would like to know if it is possible to upgrade standalone solr from 4.x to >> 8.x >> Is there a wiki available. Please let me know. > > In most cases when jumping more than one major version you will have to > completely reindex from scratch. > > You can't upgrade it step-by-step to one major version at a time, because > starting in one of the 6.x versions, the Lucene version that originally wrote > each segment is recorded and never gets updated or removed. If a segment has > no version or the earliest version recorded is less than 7.0, then 8.x will > refuse to open it. 9.x is similar for anything older than 8.0. > > I have seen a tool that bypasses this version check, allowing upgrades that > Lucene prevents. Even if you did use that tool and managed to get it to > work, it's a bad idea, which is why it's explicitly blocked. > > Thanks, > Shawn _______________________ Eric Pugh | Founder & CEO | OpenSource Connections, LLC | 434.466.1467 | http://www.opensourceconnections.com <http://www.opensourceconnections.com/> | My Free/Busy <http://tinyurl.com/eric-cal> Co-Author: Apache Solr Enterprise Search Server, 3rd Ed <https://www.packtpub.com/big-data-and-business-intelligence/apache-solr-enterprise-search-server-third-edition-raw> This e-mail and all contents, including attachments, is considered to be Company Confidential unless explicitly stated otherwise, regardless of whether attachments are marked as such.
