kibana not trending over parsed timestamp

I am trying to trend the below data over the archived timestamp. I am not sure why my dates and times aren't parsed. According to my grok debugger it works just fine.

https://i.sstatic.net/GDFAy.png

Sample Input:

[15/06/02@11:05:31.233-0700] P-007158 T-4131301152 2 WS 4GLTRACE       Run htmAssociate "vsess vsess 1349" [htmOffsets - dpa/setup/vsysadv.w @ 9563]

Config file

input {
file {
    path =>    "/Users/philipp/Documents/Performance/ProductionMetrics/4gltrace_logs/4gltrace_log_bstash.txt"
    start_position => beginning
} 
}
     filter {
     grok {
match => ["message", "\[%{DATE}@%{TIME}-%{INT:TIMEZONE}] %{NOTSPACE:PID} %  {NOTSPACE:T} %{INT:NUM} %{WORD:WS} %{WORD:4GLTRACE} %{GREEDYDATA} \[%{DATA:PROGRAM}]"]
}

}

output { 
    elasticsearch { host => localhost protocol => "http" port => "9200" } 
     stdout { codec => rubydebug } 
    }

I am sure its a silly oversight but not sure where it is. Any help is appreciated.

You need to use the date{} filter in logstash to take a field from your event and replace @timestamp with that value.

If you had a field called my_timestamp with the following format, this would do it:

date {
  match => [ 'my_timestamp', "dd/MMM/yyyy:HH:mm:ss Z" ]
  remove_field => [ 'my_timestamp' ]
}