[7.9] [Vega] Write tutorials and reference (#71028)

[wylieconlon]

Backports the following commits to 7.9:

• [Vega] Write tutorials and reference ([Vega] Write tutorials and reference #71028)

[kibanamachine]

💛 Build succeeded, but was flaky

• continuous-integration/kibana-ci/pull-request
• Commit: 8a1f969
• Flaky suites:
  • xpack-kibana-ciGroup7

---

Test Failures

Kibana Pipeline / kibana-xpack-agent / Chrome X-Pack UI Functional Tests.x-pack/test/functional/apps/dashboard_mode/dashboard_empty_screen·js.dashboard mode empty dashboard "before all" hook for "adds Lens visualization to empty dashboard"

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Failed Tests Reporter:
  - Test has not failed recently on tracked branches

[00:00:00]       │
[00:09:27]         └-: dashboard mode
[00:09:27]           └-> "before all" hook
[00:14:54]           └-: empty dashboard
[00:14:54]             └-> "before all" hook
[00:14:54]             └-> "before all" hook
[00:14:54]               │ info [logstash_functional] Loading "mappings.json"
[00:14:54]               │ info [logstash_functional] Loading "data.json.gz"
[00:14:54]               │ info [logstash_functional] Skipped restore for existing index "logstash-2015.09.22"
[00:14:54]               │ info [logstash_functional] Skipped restore for existing index "logstash-2015.09.20"
[00:14:54]               │ info [logstash_functional] Skipped restore for existing index "logstash-2015.09.21"
[00:14:56]               │ info [lens/basic] Loading "mappings.json"
[00:14:56]               │ info [lens/basic] Loading "data.json.gz"
[00:14:56]               │ info [o.e.c.m.MetadataDeleteIndexService] [kibana-ci-immutable-ubuntu-18-tests-xl-1594839156957637358] [.kibana_1/hl7WA42ZThKipjAT_CWTDg] deleting index
[00:14:56]               │ info [o.e.c.m.MetadataDeleteIndexService] [kibana-ci-immutable-ubuntu-18-tests-xl-1594839156957637358] [.kibana_2/Dvw5iY_sTlCbx7MCdvdifg] deleting index
[00:14:56]               │ info [lens/basic] Deleted existing index [".kibana_2",".kibana_1"]
[00:14:56]               │ info [o.e.c.m.MetadataCreateIndexService] [kibana-ci-immutable-ubuntu-18-tests-xl-1594839156957637358] [.kibana] creating index, cause [auto(bulk api)], templates [], shards [1]/[1]
[00:14:56]               │ info Taking screenshot "/dev/shm/workspace/kibana/x-pack/test/functional/screenshots/failure/dashboard mode empty dashboard _before all_ hook.png"
[00:14:56]               │ info [o.e.c.m.MetadataMappingService] [kibana-ci-immutable-ubuntu-18-tests-xl-1594839156957637358] [.kibana/Nkw0HMs_TkWTeGl7fV_tTg] create_mapping [_doc]
[00:14:57]               │ info Current URL is: http://localhost:6181/app/dashboards#/view/d7a41cf0-c6d2-11ea-96e2-2d63454025ce?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:%272015-09-19T06:31:44.000Z%27,to:%272015-09-23T18:31:44.000Z%27))&_a=(description:%27%27,filters:!((%27$state%27:(store:appState),meta:(alias:!n,disabled:!f,formattedValue:%270%27,index:%27logstash-*%27,key:memory,negate:!f,params:(gte:0,lt:40000),type:range),range:(memory:(gte:0,lt:40000)))),fullScreenMode:!f,options:(hidePanelTitles:!f,useMargins:!t),query:(language:kuery,query:%27%27),timeRestore:!f,title:%27Dashboard%20View%20Mode%20Test%20Dashboard%27,viewMode:view)
[00:14:57]               │ info Saving page source to: /dev/shm/workspace/kibana/x-pack/test/functional/failure_debug/html/dashboard mode empty dashboard _before all_ hook.html
[00:14:57]               └- ✖ fail: dashboard mode empty dashboard "before all" hook for "adds Lens visualization to empty dashboard"
[00:14:57]               │      Error: [invalid_alias_name_exception] Invalid alias name [.kibana], an index exists with the same name as the alias, with { index_uuid="Nkw0HMs_TkWTeGl7fV_tTg" & index=".kibana" }
[00:14:57]               │       at respond (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/transport.js:349:15)
[00:14:57]               │       at checkRespForFailure (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/transport.js:306:7)
[00:14:57]               │       at HttpConnector.<anonymous> (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/connectors/http.js:173:7)
[00:14:57]               │       at IncomingMessage.wrapper (/dev/shm/workspace/kibana/node_modules/lodash/lodash.js:4929:19)
[00:14:57]               │       at endReadableNT (_stream_readable.js:1145:12)
[00:14:57]               │       at process._tickCallback (internal/process/next_tick.js:63:19)
[00:14:57]               │ 
[00:14:57]               │ 

Stack Trace

{ Error: [invalid_alias_name_exception] Invalid alias name [.kibana], an index exists with the same name as the alias, with { index_uuid="Nkw0HMs_TkWTeGl7fV_tTg" & index=".kibana" }
    at respond (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/transport.js:349:15)
    at checkRespForFailure (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/transport.js:306:7)
    at HttpConnector.<anonymous> (/dev/shm/workspace/kibana/node_modules/elasticsearch/src/lib/connectors/http.js:173:7)
    at IncomingMessage.wrapper (/dev/shm/workspace/kibana/node_modules/lodash/lodash.js:4929:19)
    at endReadableNT (_stream_readable.js:1145:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)
  status: 400,
  displayName: 'BadRequest',
  message:
   '[invalid_alias_name_exception] Invalid alias name [.kibana], an index exists with the same name as the alias, with { index_uuid="Nkw0HMs_TkWTeGl7fV_tTg" & index=".kibana" }',
  path: '/.kibana_1',
  query: { include_type_name: false },
  body:
   { error:
      { root_cause: [Array],
        type: 'invalid_alias_name_exception',
        reason:
         'Invalid alias name [.kibana], an index exists with the same name as the alias',
        index_uuid: 'Nkw0HMs_TkWTeGl7fV_tTg',
        index: '.kibana' },
     status: 400 },
  statusCode: 400,
  response:
   '{"error":{"root_cause":[{"type":"invalid_alias_name_exception","reason":"Invalid alias name [.kibana], an index exists with the same name as the alias","index_uuid":"Nkw0HMs_TkWTeGl7fV_tTg","index":".kibana"}],"type":"invalid_alias_name_exception","reason":"Invalid alias name [.kibana], an index exists with the same name as the alias","index_uuid":"Nkw0HMs_TkWTeGl7fV_tTg","index":".kibana"},"status":400}',
  toString: [Function],
  toJSON: [Function] }

---

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To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[wylieconlon]

@elasticmachine merge upstream