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Backport PR #12801 to 7.x: Docs: note on quoted field references (#12817)

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see GH-5591

Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>
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Karol Bucek 2021-04-14 11:26:46 +02:00 • committed by GitHub
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6
docs/static/field-reference.asciidoc vendored
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@ -42,6 +42,12 @@ fieldReferenceLiteral
: ( pathFragment )+
;
NOTE: In Logstash 7.x and earlier, a quoted value (such as `["foo"]`) is
considered a field reference and isn't treated as a single element array. This
behavior might cause confusion in conditionals, such as `[message] in ["foo",
"bar"]` compared to `[message] in ["foo"]`. We discourage using names with
quotes, such as `"\"foo\""`, as this behavior might change in the future.
[float]
[[formal-grammar-field-reference]]
==== Field Reference (Event APIs)