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Doc: Update docs for testing for boolean fields #18271

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Doc: Update docs for testing for boolean fields #18271

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4 changes: 3 additions & 1 deletion docs/reference/tips-best-practices.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
---

Check notice on line 1 in docs/reference/tips-best-practices.md

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GitHub Actions / docs-preview / build 

Irregular whitespace character detected: U+200B (Zero Width Space (ZWSP)). This may impair Markdown rendering.
mapped_pages:
- https://www.elastic.co/guide/en/logstash/current/tips.html
---
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# we use a "temporal" field with a predefined arbitrary known value that
# lives only in filtering stage.
add_field => { "[@metadata][test_field_check]" => "a null value" }
}

filter {
mutate {
# we copy the field of interest into that temporal field.
# If the field doesn't exist, copy is not executed.
copy => { "test_field" => "[@metadata][test_field_check]" }
}


# now we now if testField didn't exists, our field will have
# the initial arbitrary value
if [@metadata][test_field_check] == "a null value" {
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