#27345 Added public createTTLIndex method

Author: Joe Bennett

components/lock.rst

@@ -225,7 +225,7 @@ MongoDbStore
 
 The MongoDbStore saves locks on a MongoDB server, it requires a ``\MongoDB\Client``
 connection from `mongodb/mongodb`_.
-This store does not support blocking, and expects a TTL to avoid stalled locks::
+This store does not support blocking and expects a TTL to avoid stalled locks::
 
     use Symfony\Component\Lock\Store\MongoDbStore;
 
@@ -480,7 +480,7 @@ For more details see: https://docs.mongodb.com/manual/reference/limits/#Index-Ke
 
 A TTL index MUST BE used on MongoDB 2.2+ to automatically clean up expired locks.
 
-Such an index can for example look like this:
+Such an index can be created manually:
 
 .. code-block:: javascript
 
@@ -489,6 +489,9 @@ Such an index can for example look like this:
         { "expireAfterSeconds": 0 }
     )
 
+Alternatively, the method ``MongoDbStore::createTTLIndex()`` can be called once
+to create the TTL index during setup.
+
 For more details see: http://docs.mongodb.org/manual/tutorial/expire-data/
 
 writeConcern, readConcern and readPreference are not specified by MongoDbStore