Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/3600
The thread is becoming confused as to what the default behavior should be.
In brief I think the code should say:
```
public static final ConfigOption<Boolean> ZOOKEEPER_SASL_DISABLE =
key("zookeeper.sasl.disable")
.defaultValue(false);
```
The above would leave SASL _enabled_ by default, as is consistent with
Flink 1.2.0.
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