Since VuFind is still in Beta status, from time to time or between releases you may be expected to re-index your records. To do so, simply stop vufind from running

%> ./vufind.sh stop

Then delete your index on the server

%> rm -rf vufind/solr/data/index

Now, start the vufind server

%> ./vufind.sh start

And run the import tool against your marc file.