dejaVu 是一款较为安全的数据在线处理工具，也是一个 ElasticSearch 的 Web UI 工具，用户不用担心被非法入侵。与传统的数据处理工具相比，dejaVu 的界面更具风格，在用户的交互方面，dejaVu 也更人性化，比如，dejaVu 支持无页面重新加载，无限滚动，创建过滤器视图等。
dejaVu 1.4.0 版本带来了许多使用体验上的改进，以及对新手入门门槛的改进。 此外，还包括一些重要的 bug 修复。具体如下：
Increase scroll_time to
1m to ensure timeout doesn't happen on bigger downloads #145
Start an app in "Editing" mode by default if there is no data.
Show types whether they have data or not.
Reload button now updates both the new types as well as data changes.
Stopped periodic fetching of /_mapping endpoint to update types, reducing the overall requests dejavu makes.
Show an option to add a "Data Field" in the center when no data is present in the view.
Show a warning message when a user tries to connect to an ES cluster on
http:// scheme while the browser is using
Show an error modal when a user tries to connect to an index that doesn't yet exist (applicable to an Elasticsearch cluster).
When exporting CSV, some numeric fields aren't exported #146
Text datatype fields can't be sorted upon because of field_data. We now detect if a sub-field with
Keyword datatype is present and then sort by that instead, otherwise not show a sort option #147
An issue similar to the above affected pagination requests when a sort was applied on a
Keyword sub-field. We had to ensure the pagination request would use the sortby field as the same
Keyword sub-field #148
A bug when
SearchableText type was applied. While we set indexing time analyzer to n_gram, the search time analyzer was set as standard (by default). We have now changed the search time analyzer to be
simple to prevent edge-case accuracy issues when searching #151
The necessary analyzers for the
SearchableText type related mappings were not being set by dejavu. We have fixed this #154
When using an alias (for an index), the app didn't load correctly. We have fixed this to ensure dejavu works with both an actual index name or its alias #150
Fixed an overflow issue with a
GeoPoint type field #153