Example of copy and dynamic fields in Solr schema

schema.xml

<schema name="example" version="1.5">
    <fields>
        <field name="title" type="text_en" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="category" type="string" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="feature" type="string" indexed="true" stored="true" required="false" multiValued="true" />
        <field name="allText" type="text_en" indexed="true" stored="false" required="true" multiValued="true" />
    </fields>
    
    <copyField source="title" dest="allText" />
    <copyField source="category" dest="allText" />
    <copyField source="feature" dest="allText" />
    
    <dynamicField name="*" type="ignored" multiValued="true" />
</schema>