Can't Search query like : C++

[Pawan preet]

Respected Sir,
                      I have built an index of 10,000 urls but on 
 search of query like
 C++ it will not search.Exception from QueryParser.
 And StandardFilter also filter + character during the index like it 
 will convert C++ to C.
  
 Tell me the solution.
 With thanks,
 Pawan


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