If you need to determine whether a field like your_field exists in your Logstash data, you can use conditional statements. The steps to achieve this are below.
For numerical types, you can use the following approach:
filter {
if ([your_field]) {
# Your processing logic when the field exists
...
}
}
When handling non-numerical fields such as Boolean or String, use the following method:
filter {
if ("" in [foo]) {
# Logic for existing field
...
}
}
If you want to execute specific actions when the field is not present, use an if/else construct:
filter {
if [your_field] {
# Your processing logic when the field exists
...
} else {
# Your processing logic when the field does not exist
...
}
}
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