diff --git a/src/applications/conduit/query/ConduitResultSearchEngineExtension.php b/src/applications/conduit/query/ConduitResultSearchEngineExtension.php
--- a/src/applications/conduit/query/ConduitResultSearchEngineExtension.php
+++ b/src/applications/conduit/query/ConduitResultSearchEngineExtension.php
@@ -25,7 +25,7 @@
     return $object->getFieldSpecificationsForConduit();
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function getFieldValuesForConduit($object, $data) {
     return $object->getFieldValuesForConduit();
   }
 
diff --git a/src/applications/policy/engineextension/PhabricatorPolicySearchEngineExtension.php b/src/applications/policy/engineextension/PhabricatorPolicySearchEngineExtension.php
--- a/src/applications/policy/engineextension/PhabricatorPolicySearchEngineExtension.php
+++ b/src/applications/policy/engineextension/PhabricatorPolicySearchEngineExtension.php
@@ -30,7 +30,7 @@
     );
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function getFieldValuesForConduit($object, $data) {
     $capabilities = $object->getCapabilities();
 
     $map = array();
diff --git a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
--- a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
@@ -1138,6 +1138,11 @@
     if ($objects) {
       $field_extensions = $this->getConduitFieldExtensions();
 
+      $extension_data = array();
+      foreach ($field_extensions as $key => $extension) {
+        $extension_data[$key] = $extension->loadExtensionConduitData($objects);
+      }
+
       $attachment_data = array();
       foreach ($attachments as $key => $attachment) {
         $attachment_data[$key] = $attachment->loadAttachmentData(
@@ -1148,7 +1153,8 @@
       foreach ($objects as $object) {
         $field_map = $this->getObjectWireFieldsForConduit(
           $object,
-          $field_extensions);
+          $field_extensions,
+          $extension_data);
 
         $attachment_map = array();
         foreach ($attachments as $key => $attachment) {
@@ -1312,11 +1318,13 @@
 
   protected function getObjectWireFieldsForConduit(
     $object,
-    array $field_extensions) {
+    array $field_extensions,
+    array $extension_data) {
 
     $fields = array();
-    foreach ($field_extensions as $extension) {
-      $fields += $extension->getFieldValuesForConduit($object);
+    foreach ($field_extensions as $key => $extension) {
+      $data = idx($extension_data, $key, array());
+      $fields += $extension->getFieldValuesForConduit($object, $data);
     }
 
     return $fields;
diff --git a/src/applications/search/engineextension/PhabricatorLiskSearchEngineExtension.php b/src/applications/search/engineextension/PhabricatorLiskSearchEngineExtension.php
--- a/src/applications/search/engineextension/PhabricatorLiskSearchEngineExtension.php
+++ b/src/applications/search/engineextension/PhabricatorLiskSearchEngineExtension.php
@@ -44,7 +44,7 @@
     );
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function getFieldValuesForConduit($object, $data) {
     return array(
       'dateCreated' => (int)$object->getDateCreated(),
       'dateModified' => (int)$object->getDateModified(),
diff --git a/src/applications/search/engineextension/PhabricatorSearchEngineExtension.php b/src/applications/search/engineextension/PhabricatorSearchEngineExtension.php
--- a/src/applications/search/engineextension/PhabricatorSearchEngineExtension.php
+++ b/src/applications/search/engineextension/PhabricatorSearchEngineExtension.php
@@ -56,7 +56,11 @@
     return array();
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function loadExtensionConduitData(array $objects) {
+    return null;
+  }
+
+  public function getFieldValuesForConduit($object, $data) {
     return array();
   }
 
diff --git a/src/applications/spaces/engineextension/PhabricatorSpacesSearchEngineExtension.php b/src/applications/spaces/engineextension/PhabricatorSpacesSearchEngineExtension.php
--- a/src/applications/spaces/engineextension/PhabricatorSpacesSearchEngineExtension.php
+++ b/src/applications/spaces/engineextension/PhabricatorSpacesSearchEngineExtension.php
@@ -63,7 +63,7 @@
     );
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function getFieldValuesForConduit($object, $data) {
     return array(
       'spacePHID' => $object->getSpacePHID(),
     );
diff --git a/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php b/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php
--- a/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php
+++ b/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php
@@ -80,7 +80,7 @@
     return $map;
   }
 
-  public function getFieldValuesForConduit($object) {
+  public function getFieldValuesForConduit($object, $data) {
     // TODO: This is currently very inefficient. We should bulk-load these
     // field values instead.