Choose the compatibility package for your version of Solr:
Solr 1.4.x Compatibility Package
Solr 3.1.x Compatibility Package
After download completes:-
Remove the following files from your Solr installation:
- contrib/clustering/lib/* (all files)
- dist/apache-solr-clustering-*.jar (Solr clustering plugin JAR)
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Copy the contents of the downloaded archive over the Solr home directory.
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Start Solr with the solr.clustering.enabled system property set to true
to enable the clustering plugin. Clustering should be performed by the updated Carrot2 algorithms.
Note: Carrot2 Solr Compatibility Package require Java Runtime Environment (version 1.6.0 or later).