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titleIf the secondary node is functional:

It may be possible to move SOLR collections to another node using REPLACENODE : https://lucene.apache.org/solr/guide/6_6/collections-api.html

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After doing that, take the

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node offline

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(if it wasn't yet) and purge the Locator software from the node.


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titleIf the secondary node is failed or REPLACENODE attempt did not succeed:

If the removed node was configured as a search server, you will need to reconfigure SOLR with the former node removed. See Web Server and Solr Cloud Configuration.

After that you need to do a full index rebuild - use the  Via.repository tool to Reindex all data (use the parameter /all), restart the Index Builder service and monitor the reindexing

If repositories fail to reindex, stop Index Builder, use the  Via.repository tool to Purge each repository indicated by Locator Dashboard (/all will not work, each repository to purge has to be specified explicitly), restart the Index Builder service monitor the reindexing

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