Feature Pack 7 or later

Adding native Solr query parameters to search expressions

You can add native Solr query parameters to each search profile's query parameter section to enhance and customize the final Solr query.

This param configuration can be used to declare properties that influence how the query expression gets run against the Solr server at runtime. The given name value-pair parameters will be directly added into the final SolrQuery object using the setParam(name, value) method.

Note: This feature requires the REST search API. It will not work with searches that use the BOD API. For more information about the differences between REST and BOD APIs in Feature Pack 7, see Websphere Commerce search interface.
For example:

<_config:query>
   <_config:param name="debug" value="results" />
   <_config:param name="spellcheck.collate" value="false" />