You can not search for a keyword in all fields without some extra work:
How can I search all field in SOLR that contain the keywords,.?
The "q"-Parameter contains the query string and for the standard parser this means that you must specify the field via colon like in
fieldname:searchterm
or the standard parser will use the default field. The default field is specified in the "df"-Parameter and if you did not change your solrconfig.xml you will search in the "text"-Field because you will find something like
<requestHandler name="/select" class="solr.SearchHandler">
<lst name="defaults">
<str name="df">text</str>
</lst>
</requestHandler>
P.S. If you want to search in all fields you have either to copy all field-content to one field or you must use a specific query parser like dismax parser, where you can list all your fields in the "qf"-Parameter.
P.P.S. You can not search in all fields but you can highlight in all fields :-)