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Please, note, that to get data from Solr, you don't technically need to enable the Discovery aspect, but you do need to populate the index. The statistics core is populated automatically in DSpace 1.6+. To populate the search core (DSpace 1.7+), you need to run [dspace]/bin/dspace updateindex-discovery-index (you will probably want to schedule it in cron to run periodically, too). In DSpace versions older than 4.x, the command was called [dspace]/bin/dspace update-discovery-index.There should be no reason to access the oai core (DSpace 3.0), because it contains the same information as the search core, but if you want to populate it, run [dspace]/bin/dspace oai import.

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If for whatever reason you need to delete the data in your index (which would normally be followed by running [dspace]/bin/dspace index-discovery (in DSpace versions older than 4.x, it was called [dspace]/bin/dspace update-discovery-index), but you can use the -b parameter instead to reindex everything), here's how you can do it:

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