roschaefer 132c12a7d3 Close neo4j driver sessions
We had this error in our neo4j pod recently:

```
2019-12-02 08:29:42.680+0000 ERROR Unable to schedule bolt session 'bolt-1018230' for execution since there are no available threads to serve it at the moment. You can retry at a later time or consider increasing max thread pool size for bolt connector(s).
2019-12-02 08:29:42.680+0000 ERROR Unable to schedule bolt session 'bolt-1018224' for execution since there are no available threads to serve it at the moment. You can retry at a later time or consider increasing max thread pool size for bolt connector(s).
2019-12-02 08:29:42.681+0000 ERROR Unable to schedule bolt session 'bolt-1018352' for execution since there are no available threads to serve it at the moment. You can retry at a later time or consider increasing max thread pool size for bolt connector(s).
2019-12-02 08:29:42.682+0000 ERROR Unable to schedule bolt session 'bolt-1018243' for execution since there are no available threads to serve it at the moment. You can retry at a later time or consider increasing max thread pool size for bolt connector(s).
```

Apparently the default is 400 threads. So we must have a leak somewhere.
2019-12-02 18:12:11 +01:00
..
2019-12-02 18:12:11 +01:00
2019-10-04 01:39:18 +02:00