diff --git a/lib/Alchemy/Phrasea/Core/Version.php b/lib/Alchemy/Phrasea/Core/Version.php
index a4971ffaf1..82a64c0955 100644
--- a/lib/Alchemy/Phrasea/Core/Version.php
+++ b/lib/Alchemy/Phrasea/Core/Version.php
@@ -17,7 +17,7 @@ class Version
      * @var string
      */
 
-    private $number = '4.1.0-alpha.25a';
+    private $number = '4.1.0-alpha.26a';
 
     /**
      * @var string
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
index 07e54449eb..cf4b262ef9 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
@@ -38,7 +38,7 @@ class ElasticsearchOptions
     /** @var string */
     private $populateDirection;
 
-    /** @var  int[] */
+    /** @var  int[][] */
     private $_customValues = [];
     private $activeTab;
 
@@ -437,15 +437,9 @@ class ElasticsearchOptions
     /**
      * @return string
      */
-    public function getPopulateOrderAsSQL()
+    public function getPopulateOrder()
     {
-        static $orderAsColumn = [
-            self::POPULATE_ORDER_RID     => "`record_id`",
-            self::POPULATE_ORDER_MODDATE => "`moddate`",
-        ];
-
-        // populateOrder IS one of the keys (ensured by setPopulateOrder)
-        return $orderAsColumn[$this->populateOrder];
+        return $this->populateOrder;
     }
 
     /**
@@ -465,6 +459,14 @@ class ElasticsearchOptions
     }
 
 
+    /**
+     * @return string
+     */
+    public function getPopulateDirection()
+    {
+        return $this->populateDirection;
+    }
+
     /**
      * @return string
      */
@@ -474,4 +476,4 @@ class ElasticsearchOptions
         return $this->populateDirection;
     }
 
-}
+}
\ No newline at end of file
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Fetcher.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Fetcher.php
index a57339b9fc..8fc8be1677 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Fetcher.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Fetcher.php
@@ -11,7 +11,6 @@
 
 namespace Alchemy\Phrasea\SearchEngine\Elastic\Indexer\Record;
 
-use Alchemy\Phrasea\Core\PhraseaTokens;
 use Alchemy\Phrasea\SearchEngine\Elastic\ElasticsearchOptions;
 use Alchemy\Phrasea\SearchEngine\Elastic\Exception\Exception;
 use Alchemy\Phrasea\SearchEngine\Elastic\Indexer\Record\Delegate\FetcherDelegate;
@@ -19,7 +18,9 @@ use Alchemy\Phrasea\SearchEngine\Elastic\Indexer\Record\Delegate\FetcherDelegate
 use Closure;
 use databox;
 use Doctrine\DBAL\Connection;
-use Doctrine\DBAL\Driver\Connection as ConnectionInterface;
+use Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Driver\Statement;
+use LogicException;
 use PDO;
 
 class Fetcher
@@ -30,8 +31,16 @@ class Fetcher
     private $statement;
     private $delegate;
 
-    // since we fetch records dy DESC, this will be the HIGHEST record_id fetched during last batch
-    private $upper_rid = PHP_INT_MAX;
+    // since we fetch records dy different order/direction, we setup sql limit
+    /** @var int|string  */
+    private $boundLimit;           // may be highest or lowest int or date, as a startup condition for sql or loop
+    /** @var int|string */
+    private $lastLimit;            // the last falue fetched
+    /** @var Closure  */
+    private $updateLastLimitDelegate;   // must update the lastLimit by comparing the current record rid or moddate while fetching
+    /** @var string  */
+    private $sqlLimitColumn;            // the sql expresion(column) used to order/compare (record_id or moddate)
+
     private $batchSize = 1;
     private $buffer = array();
 
@@ -46,6 +55,32 @@ class Fetcher
         $this->connection = $databox->get_connection();;
         $this->hydrators  = $hydrators;
         $this->delegate   = $delegate ?: new FetcherDelegate();
+
+        // set the boundLimit and updateDelegate, depends on populate-order and populate-direction
+        // the bound limit value is used on first run, but also as initial value on fetch loop
+
+        $this->sqlLimitColumn = ($options->getPopulateOrder() === $options::POPULATE_ORDER_RID) ?
+            'record_id'
+            :
+            'DATE_FORMAT(moddate, \'%Y%m%d%H%i%s\')';     // handles "0000-00..." better than timestamp
+        //
+        // too bad we cannot assign to a variable a builtin function ("min" or "max") as a closure (= vector)
+        // we need to encapsulate the builtin function into a closure in php.
+        //
+        if($options->getPopulateDirection() === $options::POPULATE_DIRECTION_ASC) {
+            $this->boundLimit = 0;
+            $this->updateLastLimitDelegate = function($record) {
+                $this->lastLimit = max($this->lastLimit, (int)($record['limit_value']));
+            };
+        }
+        else {
+            $this->boundLimit = PHP_INT_MAX;
+            $this->updateLastLimitDelegate = function($record) {
+                $this->lastLimit = min($this->lastLimit, (int)($record['limit_value']));
+            };
+        }
+        // limit for first run
+        $this->lastLimit = $this->boundLimit;
     }
 
     public function getDatabox()
@@ -53,6 +88,11 @@ class Fetcher
         return $this->databox;
     }
 
+    /**
+     * @return mixed
+     * @throws DBALException
+     * @throws Exception
+     */
     public function fetch()
     {
         if (empty($this->buffer)) {
@@ -65,24 +105,29 @@ class Fetcher
         return array_pop($this->buffer);
     }
 
+    /**
+     * @return array
+     * @throws DBALException
+     * @throws Exception
+     */
     private function fetchBatch()
     {
         // Fetch records rows
         $statement = $this->getExecutedStatement();
-        // printf("Query %d(%d) -> %d rows\n", $this->upper_rid, $this->batchSize, $statement->rowCount());
+        // printf("Query %d(%d) -> %d rows\n", $this->lastLimit, $this->batchSize, $statement->rowCount());
 
         $records = [];
-        $this->upper_rid = PHP_INT_MAX;
+        $this->lastLimit = $this->boundLimit;   // initial low or high value
         while ($record = $statement->fetch()) {
             $records[$record['record_id']] = $record;
-            $rid = (int)($record['record_id']);
-            if($rid < $this->upper_rid) {
-                $this->upper_rid = (int)($record['record_id']);
-            }
+            // compare/update limit
+            // call_user_func($this->updateLastLimitDelegate, $records);
+            ($this->updateLastLimitDelegate)($record);
         }
         if (empty($records)) {
+            /** @noinspection PhpUndefinedMethodInspection */
             $this->onDrain->__invoke();
-            return;
+            return [];
         }
 
         // Hydrate records
@@ -96,6 +141,7 @@ class Fetcher
         }
 
         if ($this->postFetch) {
+            /** @noinspection PhpUndefinedMethodInspection */
             $this->postFetch->__invoke($records);
         }
 
@@ -105,13 +151,13 @@ class Fetcher
     public function restart()
     {
         $this->buffer = array();
-        $this->upper_rid = PHP_INT_MAX;
+        $this->lastLimit = $this->boundLimit;
     }
 
     public function setBatchSize($size)
     {
         if ($size < 1) {
-            throw new \LogicException("Batch size must be greater than or equal to 1");
+            throw new LogicException("Batch size must be greater than or equal to 1");
         }
         $this->batchSize = (int) $size;
     }
@@ -127,28 +173,34 @@ class Fetcher
     }
 
     /**
-     * @return \Doctrine\DBAL\Driver\Statement
+     * @return Statement
+     * @throws DBALException
      */
     private function getExecutedStatement()
     {
         if (!$this->statement) {
             $sql =  "SELECT r.*, c.asciiname AS collection_name, subdef.width, subdef.height, subdef.size\n"
-                 . " FROM ((\n"
-                 . "     SELECT r.record_id, r.coll_id AS collection_id, r.uuid, r.status AS flags_bitfield, r.sha256,\n"
-                 . "            r.originalname AS original_name, r.mime, r.type, r.parent_record_id,\n"
-                 . "            r.credate AS created_on, r.moddate AS updated_on, r.coll_id\n"
-                 . "     FROM record r\n"
-                 . "     WHERE -- WHERE\n"
-                 . "     ORDER BY " . $this->options->getPopulateOrderAsSQL() . " " . $this->options->getPopulateDirectionAsSQL() . "\n"
-                 . "     LIMIT :limit\n"
-                 . "   ) AS r\n"
-                 . "   INNER JOIN coll c ON (c.coll_id = r.coll_id)\n"
-                 . " )\n"
-                 . " LEFT JOIN\n"
-                 . " subdef ON subdef.record_id=r.record_id AND subdef.name='document'\n"
-                 . " ORDER BY " . $this->options->getPopulateOrderAsSQL() . " " . $this->options->getPopulateDirectionAsSQL() . "";
+                . " FROM ((\n"
+                . "     SELECT record_id, coll_id AS collection_id, uuid, status AS flags_bitfield, sha256,\n"
+                . "            originalname AS original_name, mime, type, parent_record_id,\n"
+                . "            credate AS created_on, moddate AS updated_on, coll_id,\n"
+                . "            " . $this->sqlLimitColumn . " AS limit_value\n"
+                . "     FROM record\n"
+                . "     WHERE -- WHERE\n"
+                . "     ORDER BY " . ($this->options->getPopulateOrder() === $this->options::POPULATE_ORDER_RID ? 'record_id':'moddate')
+                . " " . $this->options->getPopulateDirectionAsSQL() . "\n"
+                . "     LIMIT :limit\n"
+                . "   ) AS r\n"
+                . "   INNER JOIN coll c ON (c.coll_id = r.coll_id)\n"
+                . " )\n"
+                . " LEFT JOIN\n"
+                . " subdef ON subdef.record_id=r.record_id AND subdef.name='document'\n"
+                . " ORDER BY " . ($this->options->getPopulateOrder() === $this->options::POPULATE_ORDER_RID ? 'record_id':'updated_on')
+                . " " . $this->options->getPopulateDirectionAsSQL() . "";
 
-            $where = 'record_id < :upper_rid';
+            $where = $this->sqlLimitColumn .
+                ($this->options->getPopulateDirection() === $this->options::POPULATE_DIRECTION_DESC ? ' < ' : ' > ') .
+                ':bound';
             if( ($w = $this->delegate->buildWhereClause()) != '') {
                 $where = '(' . $where . ') AND (' . $w . ')';
             }
@@ -175,12 +227,12 @@ class Fetcher
                     }
                 }
                 // Reference bound parameters
-                $statement->bindParam(':upper_rid', $this->upper_rid, PDO::PARAM_INT);
+                $statement->bindParam(':bound', $this->lastLimit, PDO::PARAM_INT);
                 $statement->bindParam(':limit', $this->batchSize, PDO::PARAM_INT);
                 $this->statement = $statement;
             } else {
                 // Inject own query parameters
-                $params[':upper_rid'] = $this->upper_rid;
+                $params[':bound'] = $this->lastLimit;
                 $params[':limit'] = $this->batchSize;
                 $types[':offset'] = $types[':limit'] = PDO::PARAM_INT;
 
@@ -192,4 +244,4 @@ class Fetcher
 
         return $this->statement;
     }
-}
+}
\ No newline at end of file
diff --git a/lib/classes/patch/410alpha26a.php b/lib/classes/patch/410alpha26a.php
new file mode 100644
index 0000000000..3d61ebcdc3
--- /dev/null
+++ b/lib/classes/patch/410alpha26a.php
@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2019 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Alchemy\Phrasea\Application;
+
+class patch_410alpha26a implements patchInterface
+{
+    /** @var string */
+    private $release = '4.1.0-alpha.26a';
+
+    /** @var array */
+    private $concern = [base::DATA_BOX];
+
+    /**
+     * Returns the release version.
+     *
+     * @return string
+     */
+    public function get_release()
+    {
+        return $this->release;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function concern()
+    {
+        return $this->concern;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function require_all_upgrades()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDoctrineMigrations()
+    {
+        return [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(base $databox, Application $app)
+    {
+        $sql = "ALTER TABLE `record` ADD INDEX `moddate` (`moddate`);";
+        try {
+            $stmt = $databox->get_connection()->prepare($sql);
+            $stmt->execute();
+            $stmt->closeCursor();
+        }
+        catch (\Exception $e) {
+            // the index already exists ?
+        }
+
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/lib/conf.d/bases_structure.xml b/lib/conf.d/bases_structure.xml
index d1cf4689ac..d922ec0312 100644
--- a/lib/conf.d/bases_structure.xml
+++ b/lib/conf.d/bases_structure.xml
@@ -3284,6 +3284,13 @@
               <field>parent_record_id</field>
             </fields>
           </index>
+          <index>
+              <name>moddate</name>
+              <type>INDEX</type>
+              <fields>
+                  <field>moddate</field>
+              </fields>
+          </index>
         </indexes>
         <engine>InnoDB</engine>
       </table>