I hope I understand your question well. so I had the same problem. This is what I did:
1. Create a file: solr_home/PROJECT/multicore/core1/data/external_popularProducts.txt The file should contain values like this: uniqueID_in_core=count Example: 873728721=19 842728342=20 2. Update schema.xml, add this under <types> </types> <fieldType name="popularProductsFile" keyField="key" defVal="0" stored="true" indexed="true" class="solr.ExternalFileField" valType="float" /> Here, key is the column name for the primaryID of solr core. Add this under <fields></fields> <field name="popularProducts" type="popularProductsFile" indexed="true" stored="true" /> 3. Reload the core. -- View this message in context: http://lucene.472066.n3.nabble.com/update-external-file-tp4165563p4165572.html Sent from the Solr - User mailing list archive at Nabble.com.