From ee078a5b8985b72203731cda6468e9186641d8ba Mon Sep 17 00:00:00 2001
From: Yuliia Naumenko <jo.naumenko@gmail.com>
Date: Wed, 15 Apr 2020 08:20:56 -0700
Subject: [PATCH] Fixed inability to clear numeric field in a "Group over top
 docs" condition (#63543) (#63589)

---
 .../public/common/expression_items/group_by_over.tsx  | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/x-pack/plugins/triggers_actions_ui/public/common/expression_items/group_by_over.tsx b/x-pack/plugins/triggers_actions_ui/public/common/expression_items/group_by_over.tsx
index 6ad52a5416163..619d85d99719b 100644
--- a/x-pack/plugins/triggers_actions_ui/public/common/expression_items/group_by_over.tsx
+++ b/x-pack/plugins/triggers_actions_ui/public/common/expression_items/group_by_over.tsx
@@ -146,16 +146,13 @@ export const GroupByExpression = ({
           {groupByTypes[groupBy].sizeRequired ? (
             <Fragment>
               <EuiFlexItem grow={false}>
-                <EuiFormRow
-                  isInvalid={errors.termSize.length > 0 && termSize !== undefined}
-                  error={errors.termSize}
-                >
+                <EuiFormRow isInvalid={errors.termSize.length > 0} error={errors.termSize}>
                   <EuiFieldNumber
-                    isInvalid={errors.termSize.length > 0 && termSize !== undefined}
-                    value={termSize}
+                    isInvalid={errors.termSize.length > 0}
+                    value={termSize || ''}
                     onChange={e => {
                       const { value } = e.target;
-                      const termSizeVal = value !== '' ? parseFloat(value) : MIN_TERM_SIZE;
+                      const termSizeVal = value !== '' ? parseFloat(value) : undefined;
                       onChangeSelectedTermSize(termSizeVal);
                     }}
                     min={MIN_TERM_SIZE}