Enable --incompatible_disallow_filetype by default.

Fixes #5831

RELNOTES: --incompatible_disallow_filetype is enabled by default.
PiperOrigin-RevId: 233808118
diff --git a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
index 30ea540..bb92321 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
@@ -276,15 +276,14 @@
 
   @Option(
       name = "incompatible_disallow_filetype",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.SKYLARK_SEMANTICS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
       metadataTags = {
         OptionMetadataTag.INCOMPATIBLE_CHANGE,
         OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
       },
-      help = "If set to true, function `FileType` is not available."
-  )
+      help = "If set to true, function `FileType` is not available.")
   public boolean incompatibleDisallowFileType;
 
   @Option(
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
index 3a7882a..de054dc 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
@@ -222,7 +222,7 @@
           .incompatibleDisableObjcProviderResources(false)
           .incompatibleDisallowDataTransition(true)
           .incompatibleDisallowDictPlus(false)
-          .incompatibleDisallowFileType(false)
+          .incompatibleDisallowFileType(true)
           .incompatibleDisallowLegacyJavaProvider(false)
           .incompatibleDisallowLegacyJavaInfo(false)
           .incompatibleDisallowLoadLabelsToCrossPackageBoundaries(false)