abstract public Schema::dropIndex($table, $name)
Drop an index.
$table: The table to be altered.
$name: The name of the index.
TRUE if the index was successfully dropped, FALSE if there was no index by that name to begin with.
abstract public function dropIndex($table, $name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Schema.php/function/Schema::dropIndex/8.1.x