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I wanna to run a Solr Cluster! I added zookeeper ensemble configuration in solr/bin/solr.in.sh! But there is an option which is disabled by default and I don't know what is its relation to cloud mode and what is doing exactly if enabled!

#SOLR_OPTS="$SOLR_OPTS -Dsolr.clustering.enabled=true"
Majid Hajibaba
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    Results clustering was removed in Version 8 of Solr. You can still get it to work: https://stackoverflow.com/a/71706785/796025 – rscavilla Apr 01 '22 at 12:19

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It's not related to running Solr in cloud mode (as a "cluster").

It enables or disables the Clustering component - i.e. clustering of result sets.

The clustering (or cluster analysis) plugin attempts to automatically discover groups of related search hits (documents) and assign human-readable labels to these groups.

By default in Solr, the clustering algorithm is applied to the search result of each single query -— this is called an on-line clustering. While Solr contains an extension for full-index clustering (off-line clustering) this section will focus on discussing on-line clustering only.

MatsLindh
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