From b98ccdbdd6453fea6835844648d0b80eece154b0 Mon Sep 17 00:00:00 2001
From: Lorenzo Mangani <lorenzo.mangani@gmail.com>
Date: Fri, 23 Aug 2024 16:07:26 +0200
Subject: [PATCH] Update eval.md

---
 docs/filters/eval.md | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/docs/filters/eval.md b/docs/filters/eval.md
index e93a5601..74135f51 100644
--- a/docs/filters/eval.md
+++ b/docs/filters/eval.md
@@ -12,8 +12,9 @@ Config using logstash format:
 ````
 filter {
   eval {
-    field => delay
-    operation => "x * 1000"
+    source_field => message
+    target_field => message
+    operation => "x * 100"
   }
 }
 `````
@@ -32,6 +33,6 @@ filter {
 `````
 Parameters:
 
-* ``field``: which field to work on.
-* ``operation``: javascript code to execute. The input field is in the ``x`` variable.
+* ``source_field``: which field to work on.
 * ``target_field``: field to store the result. Default : source field.
+* ``operation``: javascript code to execute. The input field is in the ``x`` variable.