Turn down app indexing for slices.

Bug: 112587202
Test: robotests
Change-Id: Ice84173bd9617f58689438c460522104776c46ce

src/com/android/settings/search/DeviceIndexFeatureProvider.java

@@ -50,7 +50,9 @@ public interface DeviceIndexFeatureProvider {
     // When the device language changes, re-index so Slices trigger in device language.
     Locale LANGUAGE = Locale.getDefault();
 
-    boolean isIndexingEnabled();
+    default boolean isIndexingEnabled() {
+        return false;
+    }
 
     void index(Context context, CharSequence title, Uri sliceUri, Uri launchUri,
             List<String> keywords);

src/com/android/settings/search/DeviceIndexFeatureProviderImpl.java

@@ -21,11 +21,6 @@ import java.util.List;
 
 public class DeviceIndexFeatureProviderImpl implements DeviceIndexFeatureProvider {
 
-    @Override
-    public boolean isIndexingEnabled() {
-        return false;
-    }
-
     @Override
     public void index(Context context, CharSequence title, Uri sliceUri, Uri launchUri,
             List<String> keywords) {