Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1598
@bbonnin Thanks for the quick review :)
1. Duplicated code in `executeDeleteQuery` is due to incompatible API
between 2.x and 5.x
```
// 2.x
public boolean isFound() { ... }
// 5.x
RestStatus.NOT_FOUND != response.status())
```
But we can extract duplicated validation logic to the base class as you
mentioned.
2. @bzz, @bbonnin Regarding to update docs,
Are there more files I should update? I am asking because
- new maven profile is added `elasticsearch-2` (activated by default),
`elasticsearch-5`
- `elasticsearch-5` profile requires java 8 +
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