indexed_search: Duplicate entry for key 'Primary' in index_rel
Wondering, why always 0 words was indexed on a specific page.
So i just inspected the query in \sysext\indexed_search\Classes\Indexer.php ~ 2010
$res = $GLOBALS['TYPO3_DB']->exec_INSERTmultipleRows('index_rel', $fields, $rows);
Result is a dublicate key and the whole page will not be indexed.
Might be the exact same issue as here (but for "index_rel"):