Kibana "Discover" default sorting policy

[Tsukiand]

**Kibana version:7.14.0

**Elasticsearch version:7.14.0

**Server OS version:Centos7

**Browser version:Google Chrome 95.0.4638.69 (x86_64)

**Browser OS version:macOS Big Sur

Original install method (e.g. download page, yum, from source, etc.):

Describe the bug:

Steps to reproduce:

1. Add a new index pattern, and use other field(we have field(not @timestamp) For example: @ts_nano) for time field
2. Open "Discover" page and use "Time" for sorting
3. Sort asc --> "sort": [{"@timestamp": {"order": "desc","unmapped_type": "boolean"}},{"@ts_nano": {"order": "asc","numeric_type": "date_nanos","unmapped_type": "boolean"}}]
4. Sort desc --> "sort": [{"@timestamp": {"order": "desc","unmapped_type": "boolean"}},{"@ts_nano": {"order": "desc","numeric_type": "date_nanos","unmapped_type": "boolean"}}]

Expected behavior: I have use @ts_nano for sorting. When sort asc --> "sort": [{"@ts_nano": {"order": "asc","numeric_type": "date_nanos","unmapped_type": "boolean"}}] When sort desc --> "sort": [{"@ts_nano": {"order": "desc","numeric_type": "date_nanos","unmapped_type": "boolean"}}] *

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

Thx @Tsukiand for reporting! I've 2 questions for this:

1. Is @timestamp also a valid field in the index pattern containing @ts_nano ?
2. Before you switched to the new index pattern, was there an index pattern selected sorted by @timestamp
3. If you click on New in Discovers toolbar, is the sorting still wrong?
   Thx!

[Tsukiand]

Thx @Tsukiand for reporting! I've 2 questions for this:

1. Is @timestamp also a valid field in the index pattern containing @ts_nano ?
2. Before you switched to the new index pattern, was there an index pattern selected sorted by @timestamp
3. If you click on New in Discovers toolbar, is the sorting still wrong?
   Thx!

1. Yes
2. Yes
3. When i use "New" in Discover toolbar, the sorting is right.

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Is this a feature by design? Or this is a kibana bug?

[kertal]

Thx, well, I'd call it a usability bug, and the good news here is: PR to fix it is on the way: #116145