Schema.xml

<!--product-->

<field name="product_name" type="text_ik" indexed="true" stored="true"/>

<field name="product_price"  type="float" indexed="true" stored="true"/>

<field name="product_description" type="text_ik" indexed="true" stored="false" />

<field name="product_picture" type="string" indexed="false" stored="true" />

<field name="product_catalog_name" type="string" indexed="true" stored="true" />

<field name="product_keywords" type="text_ik" indexed="true" stored="false" multiValued="true"/>

<copyField source="product_name" dest="product_keywords"/>

<copyField source="product_description" dest="product_keywords"/>