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Ignore clusterstate.json. Fixes #224.#426

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rokclimb15 wants to merge 1 commit intodjango-haystack:masterfrom
rokclimb15:issue-224-unknown-collection
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Ignore clusterstate.json. Fixes #224.#426
rokclimb15 wants to merge 1 commit intodjango-haystack:masterfrom
rokclimb15:issue-224-unknown-collection

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See #315

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@DhavalGojiya DhavalGojiya left a comment

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LGTM

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DhavalGojiya commented Mar 15, 2026

MAJOR-CHANGELOG:
https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html#upgrade-prerequisites

If you have an old collection that was initially created with a Solr version prior to 5.0, Solr may keep that collection’s cluster state in the /clusterstate.json file at the root of Zookeeper. Solr 9 no longer supports this file. You must upgrade such collections to the new per-collection state.json format before upgrading to Solr 9. This is done by calling the Collection API MIGRATESTATEFORMAT action while still using Solr 8.x.

Detail Context: Jira#12823

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