: I doesn't change other thing about field in default schema, so I think you
: are correct...Then here is one question: Can I use parameter to change the
: search field when query come in?

You can change the query string, or you can change the "df" dfualt search 
field, or if you are using hte dismax syntax you can change the "qf" 
query fields.

http://wiki.apache.org/solr/StandardRequestHandler#head-54c4743325ef5891a2c734963bfa367d89d7adc5
http://wiki.apache.org/solr/DisMaxRequestHandler#head-af452050ee272a1c88e2ff89dc0012049e69e180

Or you could change "The Default Search Field" right in the schema if you 
don't plan on using hte "text" field at all...

http://wiki.apache.org/solr/SchemaXml#head-b80c539a0a01eef8034c3776e49e8fe1c064f496


-Hoss

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