What filter should i use to remove the "\" from my logfile

[Jonesthomas]

i did.now it show this error

[2017-07-06T13:52:07,579][ERROR][logstash.agent ] Cannot create pipeline {:reason=>"Expected one of #, {, ,, ] at line 12, column 33 (byte 171) after filter {\n mutate {\n gsub => [ "LogMsg", '\\' , '"}