Filtering in LogStash using the if..in syntax

Elastic Stack Logstash
1

Hello,

I want to update the "tags" filed to a certain value when my "message" contains the string "Error: 18456" in it.

This is the [message] value that ends up in Kibana:
message 2019-12-26 15:07:09.53 Logon Error: 18456, Severity: 14, State: 8.

This is my filter in Logstash:
filter {
if "Error: 18456" in [message] {
mutate {
update => { "tags" => "Error - Login failed"}
}
}
}

I do not get any error when running this configuration, but the "tags" field does not get updated. Do you see a syntax or logic error in my code? Thank you!

Sincerely,

RS

2

If the tags field does not exist then update will not create it.

3

Hello Badger,

Thank you for your reply. The "tags" field indeed exists. In other filters, I am able to update "tags" on a "if in " statement. The only difference is that the other filters go against fields other than [message]. I am wondering if there is something special about the fact that I am going against the [message] field, which is incidentally of type _doc.

Sincerely,

RS

4

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