diff --git a/resources/sql/autopatches/20161130.search.02.rebuild.php b/resources/sql/autopatches/20161130.search.02.rebuild.php
--- a/resources/sql/autopatches/20161130.search.02.rebuild.php
+++ b/resources/sql/autopatches/20161130.search.02.rebuild.php
@@ -1,34 +1,7 @@
 <?php
 
+// See T11741. Long ago, in T11922, we switched from "MyISAM FULLTEXT" to
+// "InnoDB FULLTEXT". This migration prompted installs to rebuild the index.
 
-$use_mysql = false;
-
-$services = PhabricatorSearchService::getAllServices();
-foreach ($services as $service) {
-  $engine = $service->getEngine();
-  if ($engine instanceof PhabricatorMySQLFulltextStorageEngine) {
-    $use_mysql = true;
-  }
-}
-
-if ($use_mysql) {
-  $field = new PhabricatorSearchDocumentField();
-  $conn = $field->establishConnection('r');
-
-  // We're only going to require this if the index isn't empty: if you're on a
-  // fresh install, you don't have to do anything.
-  $any_documents = queryfx_one(
-    $conn,
-    'SELECT * FROM %T LIMIT 1',
-    $field->getTableName());
-
-  if ($any_documents) {
-    try {
-      id(new PhabricatorConfigManualActivity())
-        ->setActivityType(PhabricatorConfigManualActivity::TYPE_REINDEX)
-        ->save();
-    } catch (AphrontDuplicateKeyQueryException $ex) {
-      // If we've already noted that this activity is required, just move on.
-    }
-  }
-}
+// Later, in T12974, we switched from "InnoDB FULLTEXT" to "Ferret", mostly
+// mooting this. The underlying tables and engines were later removed entirely.
diff --git a/resources/sql/autopatches/20190523.myisam.01.documentfield.sql b/resources/sql/autopatches/20190523.myisam.01.documentfield.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20190523.myisam.01.documentfield.sql
@@ -0,0 +1 @@
+DROP TABLE IF EXISTS {$NAMESPACE}_search.search_documentfield;
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4530,7 +4530,6 @@
     'PhabricatorSearchDefaultController' => 'applications/search/controller/PhabricatorSearchDefaultController.php',
     'PhabricatorSearchDeleteController' => 'applications/search/controller/PhabricatorSearchDeleteController.php',
     'PhabricatorSearchDocument' => 'applications/search/storage/document/PhabricatorSearchDocument.php',
-    'PhabricatorSearchDocumentField' => 'applications/search/storage/document/PhabricatorSearchDocumentField.php',
     'PhabricatorSearchDocumentFieldType' => 'applications/search/constants/PhabricatorSearchDocumentFieldType.php',
     'PhabricatorSearchDocumentQuery' => 'applications/search/query/PhabricatorSearchDocumentQuery.php',
     'PhabricatorSearchDocumentRelationship' => 'applications/search/storage/document/PhabricatorSearchDocumentRelationship.php',
@@ -10874,7 +10873,6 @@
     'PhabricatorSearchDefaultController' => 'PhabricatorSearchBaseController',
     'PhabricatorSearchDeleteController' => 'PhabricatorSearchBaseController',
     'PhabricatorSearchDocument' => 'PhabricatorSearchDAO',
-    'PhabricatorSearchDocumentField' => 'PhabricatorSearchDAO',
     'PhabricatorSearchDocumentFieldType' => 'Phobject',
     'PhabricatorSearchDocumentQuery' => 'PhabricatorPolicyAwareQuery',
     'PhabricatorSearchDocumentRelationship' => 'PhabricatorSearchDAO',
diff --git a/src/applications/search/storage/document/PhabricatorSearchDocumentField.php b/src/applications/search/storage/document/PhabricatorSearchDocumentField.php
deleted file mode 100644
--- a/src/applications/search/storage/document/PhabricatorSearchDocumentField.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-
-final class PhabricatorSearchDocumentField extends PhabricatorSearchDAO {
-
-  protected $phidType;
-  protected $field;
-  protected $auxPHID;
-  protected $corpus;
-  protected $stemmedCorpus;
-
-  protected function getConfiguration() {
-    return array(
-      self::CONFIG_TIMESTAMPS => false,
-      self::CONFIG_IDS        => self::IDS_MANUAL,
-      self::CONFIG_COLUMN_SCHEMA => array(
-        'phidType' => 'text4',
-        'field' => 'text4',
-        'auxPHID' => 'phid?',
-        'corpus' => 'fulltext?',
-        'stemmedCorpus' => 'fulltext?',
-      ),
-      self::CONFIG_KEY_SCHEMA => array(
-        'key_phid' => null,
-        'phid' => array(
-          'columns' => array('phid'),
-        ),
-        'key_corpus' => array(
-          'columns' => array('corpus', 'stemmedCorpus'),
-          'type' => 'FULLTEXT',
-        ),
-      ),
-    ) + parent::getConfiguration();
-  }
-
-  public function getIDKey() {
-    return 'phid';
-  }
-
-}