Search "_all" field with a term

[haiwei.xie-soulinfo]

hi all,
   
    Does lucene support all fields with a term?  Can I use "_all" intead 
"fieldname"?

   As Lucene's APIs example code:
     ...
    // Parse a simple query that searches for "text":
    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "fieldname", 
analyzer);
    Query query = parser.parse("text");
     ...
   
Thanks
-- 
haiwei

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