schema.xml

Broadly, schema.xml contains the following information:

• Different types of field names of schema, and data types (<fields>…<field>)
• Definition of user/seeded defined data types (<types>…<fieldTypes>)
• Dynamic fields (<fields>….<dynamicField>)
• Information about unique key to define each document uniquely (<uniqueKey>)
• Information regarding query parser for Solr (<solrQueryParser>)
• Default search field to be used when the user does not pass the field name (<defaultSearchField>)
• Information about copying the field from one field to another (<copyField>)

In the Configuring the Apache Solr for enterprise section of Chapter 2, Getting Started with Apache Solr, we have already explained the important attributes of schema.xml. The following is a sample of the schema.xml file; the fields will look like the ones shown in the following screenshot:

You can remove all copy fields, if not needed. The unique key is used...