Export Console autocompletion functionality for use in external code editors

[cjcenizal]

Per a request from @peteharverson:

EuiCodeEditor supports just basic JSON verification. Dev Console has autocomplete of ES APIs and special features like multi-line strings within JSON useful for more complex painless. We'd like to reuse that functionality in elements of the ML UI for editing analytics configurations.

One possible solution to this request would be to export a mini-Console JSON editor that lets you whitelist various autocompletion rules of specific API endpoint bodies.

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[legrego]

Adding my own use-case:

The role management screen allows users with a Platinum or better license to specify an Elasticsearch query to restrict which documents users have access to ("Document level security").

Currently, all we give them is a simple text area, which is lacking in several respects (no auto-complete, syntax checking, etc).

Relevant issues:

• Autocomplete for DLS queries in UI #17910
• UI is confusing for configuring an elasticsearch role with Document level security #43590
• [Security] Validate Document Level Security Query #36529

[legrego]

Friendly bump to keep this on our radar. It's not a priority for us, but still something we'd love to have available to improve our role management experience when working with DLS queries.

[elasticmachine]

Pinging @elastic/kibana-management (Team:Kibana Management)