File input add_field not adding field to every row - logstash

Question

I am parsing several logfiles of different load balanced serverclusters with my logstash config and would like to add a field "log_origin" to each file's entries for the later easy filtering.
Here's my input->file config in a simple example:
input {
file {
type => "node1"
path => "C:/Development/node1/log/*"
add_field => [ "log_origin", "live_logs" ]
}
file {
type => "node2"
path => "C:/Development/node2/log/*"
add_field => [ "log_origin", "live_logs" ]
}
file {
type => "node3"
path => "C:/Development/node1/log/*"
add_field => [ "log_origin", "live_logs" ]
}
file {
type => "node4"
path => "C:/Development/node1/log/*"
add_field => [ "log_origin", "live_logs" ]
}
}
filter {
grok {
match => [
"message","%{DATESTAMP:log_timestamp}%{SPACE}\[%{DATA:class}\]%{SPACE}%{LOGLEVEL:loglevel}%{SPACE}%{GREEDYDATA:log_message}"
]
}
date {
match => [ "log_timestamp", "dd.MM.YY HH:mm:ss", "ISO8601" ]
target => "#timestamp"
}
mutate {
lowercase => ["loglevel"]
strip => ["loglevel"]
}
if "_grokparsefailure" in [tags] {
multiline {
pattern => ".*"
what => "previous"
}
}
if[fields.log_origin] == "live_logs"{
if [type] == "node1" {
mutate {
add_tag => "realsServerName1"
}
}
if [type] == "node2" {
mutate {
add_tag => "realsServerName2"
}
}
if [type] == "node3" {
mutate {
add_tag => "realsServerName3"
}
}
if [type] == "node4" {
mutate {
add_tag => "realsServerName4"
}
}
}
}
output {
stdout { }
elasticsearch { embedded => true }
}
I would have expected logstash to add this field with the value given to every logentry it finds, but it doesn't. Maybe I am completely taking the wrong approach here?
Edit: I am not able to retrieve the logs directly from the nodes, but have to copy them over to my "server". Otherwise i would be able to just use the filepath for distinguishing different clusters...
Edit: It's working. I should have cleand my data in between. Old entries without the field added cluttered up my results.

Answer 1

The add_field expects a hash. It should be
add_field => {
"log_origin" => "live_logs"
}