Why do messages and Error stack trace do not recognize new line charecters

I would like to know why new lines (\n) are available in the strack trace and why are not getting displayed in a new line. What settings I have to make such that the error stack trace appear with new line as traditional loggers and message also has has all the backslash special charecters ''

{
"@timestamp": "2018-01-27T14:52:36.708+04:00",
"@version": 1,
"message": "Invalid Request Exception: "responsePayload\":\"{\\\"status\\\":\\\"FAIL\\\",\\\"statusCode\\\":1190,\\\"",
"logger_name": "com.json.logging.demo.web.controller.ErrorHandler",
"thread_name": "http-nio-3009-exec-1",
"level": "ERROR",
"level_value": 40000,
"stack_trace": "com.json.logging.demo.exception.PullEmployeeDataException: null\n\tat    
 com.json.logging.demo.web.controller.admin.EmployeeCodeController$ 
$FastClassBySpringCGLIB$$15b35cb5.invoke(<generated>)\n\tat 
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)\n\tat 
org.springframework.aop.framework.CglibAopProxy$ glibAopProxy.java:721)\n\"

 }

I expect the output as below. I expect that the output should omit backslash charecters () and read new lines and spaces (\n\t) and print as below

     {
"@timestamp": "2018-01-27T14:52:36.708+04:00",
"@version": 1,
"message": "Invalid Request Exception: "responsePayload\":\"{ "status ": "FAIL ", "statusCode ":1190,"",
"logger_name": "com.json.logging.demo.web.controller.ErrorHandler",
"thread_name": "http-nio-3009-exec-1",
"level": "ERROR",
"level_value": 40000,
"stack_trace": "com.json.logging.demo.exception.PullEmployeeDataException: null
  at com.json.logging.demo.web.controller.admin.EmployeeCodeController
                $FastClassBySpringCGLIB$$15b35cb5.invoke(<generated>) 
  at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
  at  org.springframework.aop.framework.CglibAopProxy$ glibAopProxy.java:721)"

 }

Instead of describing what you expect, show it! What would you like the JSON object above to look like?

added the expected output in the description

What you want to have isn't valid JSON.

I have added the missing ". what I expect is that the JSON should not have the \n\t charecters inside the stacktrace or inside the message attritubute. I have applied the below config in logstash.conf but it didnt work

 input {
 stdin {
     codec => multiline {
     pattern => "^\s"
     what => "previous"
  }
   }
 }
output { 
stdout { codec => rubydebug } 
}

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