diff --git a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java
index 859b52368ea96..16d7f4a28cfd9 100644
--- a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java
+++ b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java
@@ -1922,7 +1922,7 @@ protected FullTextFunctionTestCase(Class<? extends FullTextFunction> fullTextFun
         }
 
         protected FullTextFunctionTestCase(Class<? extends FullTextFunction> fullTextFunction) {
-            this(fullTextFunction, randomFrom("text", "keyword"), randomAlphaOfLengthBetween(1, 10));
+            this(fullTextFunction, randomFrom("text", "keyword"), randomAlphaOfLengthBetween(5, 10));
         }
 
         public Class<? extends FullTextFunction> fullTextFunction() {