How can I rebuild my index from scratch if I change my schema in Solr

The most efficient/complete way is to…

1. Stop your application server

2. Change your schema.xml file

3. Delete the index directory in your data directory

4. Start your application server (Solr will detect that there is no existing index and make a new one)

5. Re-Index your data

If the permission scheme of your server does not allow you to manually delete the index directory an alternate technique is…

1. Stop your application server

2. Change your schema.xml file

3. Start your application server

4. Use the “match all docs” query in a delete by query command: <delete><query>*:*</query></delete>

5. Send an <optimize/> command.

6. Re-Index your data

It’s very important to send the “optimize” command before re-indexing. Even though you’ve deleted all the documents, some low level Lucene metadata about the fields those documents had will still be there, and will influence how future documents with the same field names are indexed

application server, data directory, field names, index directory, match, metadata, optimize, query command, schema, scratch, solr

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