Add data summary panel in discover

[chishui]

Description

UI:

1. add a button on searchbar to display or hide query assist
2. add a summary panel to display sample data summary
   They are part of query assist feature, so only when query assist is available, they could display.

Changes

Data plugin

1. add a new observable variant in search service, to provide search data result from discover, others can get notified for search result change.
2. add a new interface getSearchBarButton in QueryEditorExtensionConfig so that different query editor can display their customized button on search bar.

query_enhancements plugin

1. provide summary panel and query assist button UI.
2. add configPath "queryEnhancements" in opensearch_dashboards.json so that the feature can be control from opensearch_dashboards.yml
3. add usage_collection plugin dependency to emit metrics.

Issues Resolved

#8177

Screenshot

Testing the changes

Step 1. enable this summary feature in opensearch_dashboards.yml

queryEnhancements.queryAssist.summary.enabled: true

Step 2. Enable query enhancement from dashboard

OSD left sidebar -> management -> Dashboards Managements -> Advanced settings -> Enable query enhancements -> On

Step 3. configure OpenSearch ML agents

query assist agent

Follow #2 form this doc to configure query assist agent to enable query assist feature

summary agent

POST .plugins-ml-config/_doc/os_data2summary
{
    "type":"os_summary_root_agent",
    "configuration":{
        "agent_id": "{{ _.summary_agent_id }}"
    }
}

Step 4. Navigate to Discover page

1. Change language to PPL
2. Click expand button to show natural language input and summary panel
3. Type a command to query your data then click submit button

Changelog

Add a data summary panel on discover page under query assist function.

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[github-actions]

❌ Changelog Entry Missing Hyphen

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[kavilla]

pretty awesome! i have comments and questions but i like how it's looking.

[kavilla]

can you make sure to include a changelog? you might need to give the changelog bot permissions though. just will need to follow the directions given in the link

[chishui]

@joshuali925 @kavilla I've addressed your comments, could you help review again?

[joshuali925]

lgtm

[joshuali925]

curious does it use jest fake timers or is this actually sleeping 2 seconds?

[chishui]

It's actual sleep, I'll change it to 100ms.

[ruanyl]

What about having another event FAILED_METRIC? It doesn't seem METRIC_TYPE.COUNT is intend to be used in this way.

[chishui]

In this way we can get success rate easily only using one metric

[ruanyl]

question$ is possibly undefined, should you tweaks the type QueryAssistContextValue to question$?: BehaviorSubject<string>;?

[chishui]

Actually, question$ is always created, it could be undefined because for QueryAssistBanner, it doesn't use this variable, so I think we don't need to pass question$ to it thus it's undefined

[ruanyl]

@ashwin-pc FYI, saw you add 2.17.1 tag, since this is new feature which is not supposed to be included in 2.17.1, so removed that tag from it, let me know if you have any concern, thanks:)