diff --git a/resources/sql/autopatches/20150105.conpsearch.sql b/resources/sql/autopatches/20150105.conpsearch.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20150105.conpsearch.sql
@@ -0,0 +1,14 @@
+CREATE TABLE {$NAMESPACE}_conpherence.conpherence_index (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  threadPHID VARBINARY(64) NOT NULL,
+  transactionPHID VARBINARY(64) NOT NULL,
+  previousTransactionPHID VARBINARY(64),
+  corpus longtext
+    CHARACTER SET {$CHARSET_FULLTEXT}
+    COLLATE {$COLLATE_FULLTEXT}
+    NOT NULL,
+  KEY `key_thread` (threadPHID),
+  UNIQUE KEY `key_transaction` (transactionPHID),
+  UNIQUE KEY `key_previous` (previousTransactionPHID),
+  FULLTEXT KEY `key_corpus` (corpus)
+) ENGINE=MyISAM DEFAULT CHARSET={$CHARSET} COLLATE={$COLLATE_TEXT};
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
@@ -230,7 +230,9 @@
     'ConpherenceDAO' => 'applications/conpherence/storage/ConpherenceDAO.php',
     'ConpherenceEditor' => 'applications/conpherence/editor/ConpherenceEditor.php',
     'ConpherenceFileWidgetView' => 'applications/conpherence/view/ConpherenceFileWidgetView.php',
+    'ConpherenceFulltextQuery' => 'applications/conpherence/query/ConpherenceFulltextQuery.php',
     'ConpherenceHovercardEventListener' => 'applications/conpherence/events/ConpherenceHovercardEventListener.php',
+    'ConpherenceIndex' => 'applications/conpherence/storage/ConpherenceIndex.php',
     'ConpherenceLayoutView' => 'applications/conpherence/view/ConpherenceLayoutView.php',
     'ConpherenceListController' => 'applications/conpherence/controller/ConpherenceListController.php',
     'ConpherenceMenuItemView' => 'applications/conpherence/view/ConpherenceMenuItemView.php',
@@ -247,6 +249,7 @@
     'ConpherenceSchemaSpec' => 'applications/conpherence/storage/ConpherenceSchemaSpec.php',
     'ConpherenceSettings' => 'applications/conpherence/constants/ConpherenceSettings.php',
     'ConpherenceThread' => 'applications/conpherence/storage/ConpherenceThread.php',
+    'ConpherenceThreadIndexer' => 'applications/conpherence/search/ConpherenceThreadIndexer.php',
     'ConpherenceThreadListView' => 'applications/conpherence/view/ConpherenceThreadListView.php',
     'ConpherenceThreadMailReceiver' => 'applications/conpherence/mail/ConpherenceThreadMailReceiver.php',
     'ConpherenceThreadQuery' => 'applications/conpherence/query/ConpherenceThreadQuery.php',
@@ -3290,7 +3293,9 @@
     'ConpherenceDAO' => 'PhabricatorLiskDAO',
     'ConpherenceEditor' => 'PhabricatorApplicationTransactionEditor',
     'ConpherenceFileWidgetView' => 'ConpherenceWidgetView',
+    'ConpherenceFulltextQuery' => 'PhabricatorOffsetPagedQuery',
     'ConpherenceHovercardEventListener' => 'PhabricatorEventListener',
+    'ConpherenceIndex' => 'ConpherenceDAO',
     'ConpherenceLayoutView' => 'AphrontView',
     'ConpherenceListController' => 'ConpherenceController',
     'ConpherenceMenuItemView' => 'AphrontTagView',
@@ -3310,6 +3315,7 @@
       'ConpherenceDAO',
       'PhabricatorPolicyInterface',
     ),
+    'ConpherenceThreadIndexer' => 'PhabricatorSearchDocumentIndexer',
     'ConpherenceThreadListView' => 'AphrontView',
     'ConpherenceThreadMailReceiver' => 'PhabricatorObjectMailReceiver',
     'ConpherenceThreadQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
@@ -5603,6 +5609,7 @@
     'PhabricatorSearchDeleteController' => 'PhabricatorSearchBaseController',
     'PhabricatorSearchDocument' => 'PhabricatorSearchDAO',
     'PhabricatorSearchDocumentField' => 'PhabricatorSearchDAO',
+    'PhabricatorSearchDocumentIndexer' => 'Phobject',
     'PhabricatorSearchDocumentQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhabricatorSearchDocumentRelationship' => 'PhabricatorSearchDAO',
     'PhabricatorSearchEditController' => 'PhabricatorSearchBaseController',
diff --git a/src/applications/conpherence/editor/ConpherenceEditor.php b/src/applications/conpherence/editor/ConpherenceEditor.php
--- a/src/applications/conpherence/editor/ConpherenceEditor.php
+++ b/src/applications/conpherence/editor/ConpherenceEditor.php
@@ -459,7 +459,23 @@
   }
 
   protected function supportsSearch() {
-    return false;
+    return true;
+  }
+
+  protected function getSearchContextParameter(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+
+    $comment_phids = array();
+    foreach ($xactions as $xaction) {
+      if ($xaction->hasComment()) {
+        $comment_phids[] = $xaction->getPHID();
+      }
+    }
+
+    return array(
+      'commentPHIDs' => $comment_phids,
+    );
   }
 
 }
diff --git a/src/applications/conpherence/query/ConpherenceFulltextQuery.php b/src/applications/conpherence/query/ConpherenceFulltextQuery.php
new file mode 100644
--- /dev/null
+++ b/src/applications/conpherence/query/ConpherenceFulltextQuery.php
@@ -0,0 +1,68 @@
+<?php
+
+final class ConpherenceFulltextQuery
+  extends PhabricatorOffsetPagedQuery {
+
+  private $threadPHIDs;
+  private $fulltext;
+
+  public function withThreadPHIDs(array $phids) {
+    $this->threadPHIDs = $phids;
+    return $this;
+  }
+
+  public function withFulltext($fulltext) {
+    $this->fulltext = $fulltext;
+    return $this;
+  }
+
+  public function execute() {
+    $table = new ConpherenceIndex();
+    $conn_r = $table->establishConnection('r');
+
+    $rows = queryfx_all(
+      $conn_r,
+      'SELECT threadPHID, transactionPHID, previousTransactionPHID
+        FROM %T i %Q %Q %Q',
+      $table->getTableName(),
+      $this->buildWhereClause($conn_r),
+      $this->buildOrderByClause($conn_r),
+      $this->buildLimitClause($conn_r));
+
+    return $rows;
+  }
+
+  private function buildWhereClause($conn_r) {
+    $where = array();
+
+    if ($this->threadPHIDs !== null) {
+      $where[] = qsprintf(
+        $conn_r,
+        'i.threadPHID IN (%Ls)',
+        $this->threadPHIDs);
+    }
+
+    if (strlen($this->fulltext)) {
+      $where[] = qsprintf(
+        $conn_r,
+        'MATCH(i.corpus) AGAINST (%s IN BOOLEAN MODE)',
+        $this->fulltext);
+    }
+
+    return $this->formatWhereClause($where);
+  }
+
+  private function buildOrderByClause(AphrontDatabaseConnection $conn_r) {
+    if (strlen($this->fulltext)) {
+      return qsprintf(
+        $conn_r,
+        'ORDER BY MATCH(i.corpus) AGAINST (%s IN BOOLEAN MODE) DESC',
+        $this->fulltext);
+    } else {
+      return qsprintf(
+        $conn_r,
+        'ORDER BY id DESC');
+    }
+  }
+
+}
diff --git a/src/applications/conpherence/search/ConpherenceThreadIndexer.php b/src/applications/conpherence/search/ConpherenceThreadIndexer.php
new file mode 100644
--- /dev/null
+++ b/src/applications/conpherence/search/ConpherenceThreadIndexer.php
@@ -0,0 +1,89 @@
+<?php
+
+final class ConpherenceThreadIndexer
+  extends PhabricatorSearchDocumentIndexer {
+
+  public function getIndexableObject() {
+    return new ConpherenceThread();
+  }
+
+  protected function loadDocumentByPHID($phid) {
+    $object = id(new ConpherenceThreadQuery())
+      ->setViewer($this->getViewer())
+      ->withPHIDs(array($phid))
+      ->executeOne();
+
+    if (!$object) {
+      throw new Exception(pht('No thread "%s" exists!', $phid));
+    }
+
+    return $object;
+  }
+
+  protected function buildAbstractDocumentByPHID($phid) {
+    $thread = $this->loadDocumentByPHID($phid);
+
+    // NOTE: We're explicitly not building a document here, only rebuilding
+    // the Conpherence search index.
+
+    $context = nonempty($this->getContext(), array());
+    $comment_phids = idx($context, 'commentPHIDs');
+
+    if (is_array($comment_phids) && !$comment_phids) {
+      // If this property is set, but empty, the transaction did not
+      // include any chat text. For example, a user might have left the
+      // conversation.
+      return null;
+    }
+
+    $query = id(new ConpherenceTransactionQuery())
+      ->setViewer($this->getViewer())
+      ->withObjectPHIDs(array($thread->getPHID()))
+      ->withTransactionTypes(array(PhabricatorTransactions::TYPE_COMMENT))
+      ->needComments(true);
+
+    if ($comment_phids !== null) {
+      $query->withPHIDs($comment_phids);
+    }
+
+    $xactions = $query->execute();
+
+    foreach ($xactions as $xaction) {
+      $this->indexComment($thread, $xaction);
+    }
+
+    return null;
+  }
+
+  private function indexComment(
+    ConpherenceThread $thread,
+    ConpherenceTransaction $xaction) {
+
+    $previous = id(new ConpherenceTransactionQuery())
+      ->setViewer($this->getViewer())
+      ->withObjectPHIDs(array($thread->getPHID()))
+      ->withTransactionTypes(array(PhabricatorTransactions::TYPE_COMMENT))
+      ->setAfterID($xaction->getID())
+      ->setLimit(1)
+      ->executeOne();
+
+    $index = id(new ConpherenceIndex())
+      ->setThreadPHID($thread->getPHID())
+      ->setTransactionPHID($xaction->getPHID())
+      ->setPreviousTransactionPHID($previous ? $previous->getPHID() : null)
+      ->setCorpus($xaction->getComment()->getContent());
+
+    queryfx(
+      $index->establishConnection('w'),
+      'INSERT INTO %T
+        (threadPHID, transactionPHID, previousTransactionPHID, corpus)
+        VALUES (%s, %s, %ns, %s)
+        ON DUPLICATE KEY UPDATE corpus = VALUES(corpus)',
+      $index->getTableName(),
+      $index->getThreadPHID(),
+      $index->getTransactionPHID(),
+      $index->getPreviousTransactionPHID(),
+      $index->getCorpus());
+  }
+
+}
diff --git a/src/applications/conpherence/storage/ConpherenceIndex.php b/src/applications/conpherence/storage/ConpherenceIndex.php
new file mode 100644
--- /dev/null
+++ b/src/applications/conpherence/storage/ConpherenceIndex.php
@@ -0,0 +1,38 @@
+<?php
+
+final class ConpherenceIndex
+  extends ConpherenceDAO {
+
+  protected $threadPHID;
+  protected $transactionPHID;
+  protected $previousTransactionPHID;
+  protected $corpus;
+
+  public function getConfiguration() {
+    return array(
+      self::CONFIG_TIMESTAMPS => false,
+      self::CONFIG_COLUMN_SCHEMA => array(
+        'previousTransactionPHID' => 'phid?',
+        'corpus' => 'fulltext',
+      ),
+      self::CONFIG_KEY_SCHEMA => array(
+        'key_thread' => array(
+          'columns' => array('threadPHID'),
+        ),
+        'key_transaction' => array(
+          'columns' => array('transactionPHID'),
+          'unique' => true,
+        ),
+        'key_previous' => array(
+          'columns' => array('previousTransactionPHID'),
+          'unique' => true,
+        ),
+        'key_corpus' => array(
+          'columns' => array('corpus'),
+          'type' => 'FULLTEXT',
+        ),
+      ),
+    ) + parent::getConfiguration();
+  }
+
+}
diff --git a/src/applications/search/index/PhabricatorSearchDocumentIndexer.php b/src/applications/search/index/PhabricatorSearchDocumentIndexer.php
--- a/src/applications/search/index/PhabricatorSearchDocumentIndexer.php
+++ b/src/applications/search/index/PhabricatorSearchDocumentIndexer.php
@@ -1,6 +1,17 @@
 <?php
 
-abstract class PhabricatorSearchDocumentIndexer {
+abstract class PhabricatorSearchDocumentIndexer extends Phobject {
+
+  private $context;
+
+  protected function setContext($context) {
+    $this->context = $context;
+    return $this;
+  }
+
+  protected function getContext() {
+    return $this->context;
+  }
 
   abstract public function getIndexableObject();
   abstract protected function buildAbstractDocumentByPHID($phid);
@@ -30,9 +41,15 @@
     return $object;
   }
 
-  public function indexDocumentByPHID($phid) {
+  public function indexDocumentByPHID($phid, $context) {
     try {
+      $this->setContext($context);
+
       $document = $this->buildAbstractDocumentByPHID($phid);
+      if ($document === null) {
+        // This indexer doesn't build a document index, so we're done.
+        return $this;
+      }
 
       $object = $this->loadDocumentByPHID($phid);
 
diff --git a/src/applications/search/index/PhabricatorSearchIndexer.php b/src/applications/search/index/PhabricatorSearchIndexer.php
--- a/src/applications/search/index/PhabricatorSearchIndexer.php
+++ b/src/applications/search/index/PhabricatorSearchIndexer.php
@@ -2,25 +2,26 @@
 
 final class PhabricatorSearchIndexer {
 
-  public function queueDocumentForIndexing($phid) {
+  public function queueDocumentForIndexing($phid, $context = null) {
     PhabricatorWorker::scheduleTask(
       'PhabricatorSearchWorker',
       array(
         'documentPHID' => $phid,
+        'context' => $context,
       ),
       array(
         'priority' => PhabricatorWorker::PRIORITY_IMPORT,
       ));
   }
 
-  public function indexDocumentByPHID($phid) {
+  public function indexDocumentByPHID($phid, $context) {
     $indexers = id(new PhutilSymbolLoader())
       ->setAncestorClass('PhabricatorSearchDocumentIndexer')
       ->loadObjects();
 
     foreach ($indexers as $indexer) {
       if ($indexer->shouldIndexDocumentByPHID($phid)) {
-        $indexer->indexDocumentByPHID($phid);
+        $indexer->indexDocumentByPHID($phid, $context);
         break;
       }
     }
diff --git a/src/applications/search/management/PhabricatorSearchManagementIndexWorkflow.php b/src/applications/search/management/PhabricatorSearchManagementIndexWorkflow.php
--- a/src/applications/search/management/PhabricatorSearchManagementIndexWorkflow.php
+++ b/src/applications/search/management/PhabricatorSearchManagementIndexWorkflow.php
@@ -114,16 +114,9 @@
   }
 
   private function loadPHIDsByTypes($type) {
-    $indexer_symbols = id(new PhutilSymbolLoader())
-      ->setAncestorClass('PhabricatorSearchDocumentIndexer')
-      ->setConcreteOnly(true)
-      ->setType('class')
-      ->selectAndLoadSymbols();
-
-    $indexers = array();
-    foreach ($indexer_symbols as $symbol) {
-      $indexers[] = newv($symbol['name'], array());
-    }
+    $indexers = id(new PhutilSymbolLoader())
+      ->setAncestorClass('PhabricatorSearchObjectIndexer')
+      ->loadObjects();
 
     $phids = array();
     foreach ($indexers as $indexer) {
diff --git a/src/applications/search/worker/PhabricatorSearchWorker.php b/src/applications/search/worker/PhabricatorSearchWorker.php
--- a/src/applications/search/worker/PhabricatorSearchWorker.php
+++ b/src/applications/search/worker/PhabricatorSearchWorker.php
@@ -4,10 +4,12 @@
 
   public function doWork() {
     $data = $this->getTaskData();
+
     $phid = idx($data, 'documentPHID');
+    $context = idx($data, 'context');
 
     id(new PhabricatorSearchIndexer())
-      ->indexDocumentByPHID($phid);
+      ->indexDocumentByPHID($phid, $context);
   }
 
 }
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -800,7 +800,9 @@
 
     if ($this->supportsSearch()) {
       id(new PhabricatorSearchIndexer())
-        ->queueDocumentForIndexing($object->getPHID());
+        ->queueDocumentForIndexing(
+          $object->getPHID(),
+          $this->getSearchContextParameter($object, $xactions));
     }
 
     if ($this->shouldPublishFeedStory($object, $xactions)) {
@@ -2355,6 +2357,15 @@
     return false;
   }
 
+  /**
+   * @task search
+   */
+  protected function getSearchContextParameter(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+    return null;
+  }
+
 
 /* -(  Herald Integration )-------------------------------------------------- */
 
diff --git a/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementQuickstartWorkflow.php b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementQuickstartWorkflow.php
--- a/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementQuickstartWorkflow.php
+++ b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementQuickstartWorkflow.php
@@ -82,8 +82,8 @@
       '{$NAMESPACE}',
       $dump);
 
-    // NOTE: This is a hack. We can not use `binary` for this column, because
-    // it is part of a fulltext index.
+    // NOTE: This is a hack. We can not use `binary` for these columns, because
+    // they are a part of a fulltext index.
     $old = $dump;
     $dump = preg_replace(
       '/`corpus` longtext CHARACTER SET .* COLLATE .*,/mi',