Connection Timeout not caught by doOnError()

Hello, i have a problem with handling ConnectionTimeout. Look at this code:

```
RxJava2Adapter.flowableToFlux(dao.getAll().doOnError(e->log.error("THIS IS AN ERROR")))
.subscribeOn(elastic).log()
.publishOn(parallel).log()
.publish();
```

where dao.getAll() call is:
```
public Flowable getAll(){
Database db = Database.nonBlocking().connectionProvider(db2Config.dataSource()).build();
return db.select("select * from TABLE_A where ID=:id")
.parameter("id","20160512205855_8203501_299566")
.autoMap(Transit.class);
}
```
Now, if there is a connection timeout, no doOnError will catch the exception. After some debugging i noticed that the error is captured by RxJava2 default error handler.

There is a way to propagate the onError signal up to our stream?

Thank you,