question regarding dynamic fields

[Phanindra Reva]

Hello..,
             I have observed that the text or keywords which are being
indexed using dynamicField concept are being searchable only when we
mention field name too while querying.Am I wrong with my observation
or  is it the default and can not be changed? I am just wondering if
there is any route to search the text indexed using dynamicFields with
out having to mention the field name in the query.
Thanks.