Remove boost from FunctionScore::addFunction because this is not supported by elasticsearch
Merge pull request #507 from liip-forks/function_score_boost_refactoring

Remove boost from FunctionScore::addFunction because this is not support...
Escape slash in Util::escapeTerm
Merge pull request #512 from jpetitcolas/slash_escape

[RFR] Escape slash in Util::escapeTerm (fixes #440)