[DOCS] Document empty string boolean value as false (#61341)

jrodewig · web-flow · commit 2a49ba3252cf · 2020-08-19T12:56:57.000-04:00
diff --git a/docs/reference/mapping/types/boolean.asciidoc b/docs/reference/mapping/types/boolean.asciidoc
@@ -10,7 +10,7 @@ strings which are interpreted as either true or false:
 [horizontal]
 False values::
 
-    `false`, `"false"`
+    `false`, `"false"`, `""` (empty string)
 
 True values::
 
