Sum calculation on field with Time

Hey All,

Apologies if this is more aimed towards LogStash.
I have used LogStash to push data to Kibana from a CSV file.

This has so far been successful, my only issue atm is I now want to create a dashboard to view my data, the main data I need to calculate is a Call Duration field. This is in the format HH:MM:SS.

Unfortunately when it pushes this field to Kibana it marks it as a string so I cannot do any calculation on this.

Any help is greatly appreciated.


This is my LogStash conf file if this is any help.

input {
file {
path => "cdr.log"
start_position => "beginning"
sincedb_path => "/dev/null"
filter {
if [message] =~ /^\s*$/ { #DELETE BLANK LINE
drop { }

    csv {
            separator => ","
            columns => ["Call Duration","Call Start","Call Answered","Call End","From Name","From Number","To Name","To Number","Final Name","Final Number"]
    mutate {
            gsub => ["From Number", "Ext.", ""]
            gsub => ["To Number", "Ext.", ""]
            gsub => ["Final Number", "Ext.", ""]
            gsub => ["Call Duration", "Call ", ""]

elasticsearch {
hosts => ["IPHERE"]
index => "3cx-stats"
stdout {}

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