Logstash error when converting field [http][response][status_code] into integer

Elastic Stack Logstash
1

Tried this with logtsash 7.10.2 and 7.12.1:

The following code results in "(TypeError) no implicit conversion of nil into Integer":

mutate { add_field => {  "[http][response][status_code]" => "200" } }     <== this statement is OK
mutate { convert => {  "[http][response][status_code]" => "integer" } }  <== this statement fails

but if you rename the field to something else it works:

mutate { add_field => {  "[http][response][status_co]" => "200" } } 
mutate { convert => {  "[http][response][status_co]" => "integer" } }

So, it looks as if logstash gets confused with field named as [http][response][status_code]

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