[Discover] Remove the legacy table (elastic#201254)

- Closes elastic#167582

## Summary

This PR removes the code related to the legacy doc table and 2 Advanced
Settings: `doc_table:legacy` and `truncate:maxHeight`.

The legacy table in Discover was replaced by the new data grid in v8.3.
The `doc_table:legacy` Advanced Setting was added to let users switch
back to the legacy table if necessary. The removal of the setting and
the legacy table entirely would allow us to reduce bundle size,
maintenance burden, and code complexity.

Also the legacy table does not support many new features which were
added to the grid only (e.g. comparing selected documents, context-aware
UI based on current solution project, column resizing, bulk row
selection, copy actions, new doc viewer flyout, and more).

Since v8.15 `doc_table:legacy` is marked as deprecated on Advanced
Settings page via elastic#179899

Since v8.16 `truncate:maxHeight` is marked as deprecated too via
elastic#183736

The removal of these 2 settings and the associated code is planned for
v9.

### Checklist

- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.

---------

Co-authored-by: kibanamachine <[email protected]>
Co-authored-by: Elastic Machine <[email protected]>

Author: 3 people

.buildkite/ftr_platform_stateful_configs.yml

@@ -64,7 +64,6 @@ enabled:
   - test/functional/apps/dashboard/group5/config.ts
   - test/functional/apps/dashboard/group6/config.ts
   - test/functional/apps/discover/ccs_compatibility/config.ts
-  - test/functional/apps/discover/classic/config.ts
   - test/functional/apps/discover/embeddable/config.ts
   - test/functional/apps/discover/esql/config.ts
   - test/functional/apps/discover/group1/config.ts

docs/management/advanced-options.asciidoc

@@ -208,10 +208,6 @@ The default refresh interval for the time filter. Example:
 [[timepicker-timedefaults]]`timepicker:timeDefaults`::
 The default selection in the time filter.
 
-[[truncate-maxheight]]`truncate:maxHeight`::
-deprecated:[8.16.0]The maximum height that a cell occupies in a table. Set to 0 to disable
-truncation.
-
 [[enableESQL]]`enableESQL`::
 This setting enables ES|QL in Kibana.
 
@@ -340,14 +336,6 @@ Hides the "Time" column in *Discover* and in all saved searches on dashboards.
 Highlights results in *Discover* and saved searches on dashboards. Highlighting
 slows requests when working on big documents.
 
-[[doctable-legacy]]`doc_table:legacy`::
-deprecated:[8.15.0] Controls the way the document table looks and works.
-To use the new *Document Explorer* instead of the classic view, turn off this option.
-The *Document Explorer* offers better data sorting, resizable columns, and a full screen view.
-
-[[truncate-max-height]]`truncate:maxHeight`::
-The maximum height that a cell in a table can occupy. To disable truncation, set to 0.
-
 
 [float]
 [[kibana-ml-settings]]

packages/kbn-discover-utils/index.ts

@@ -14,7 +14,6 @@ export {
   DEFAULT_ALLOWED_LOGS_BASE_PATTERNS,
   DEFAULT_COLUMNS_SETTING,
   DOC_HIDE_TIME_COLUMN_SETTING,
-  DOC_TABLE_LEGACY,
   FIELDS_LIMIT_SETTING,
   HIDE_ANNOUNCEMENTS,
   MAX_DOC_FIELDS_DISPLAYED,
@@ -28,8 +27,6 @@ export {
   SHOW_FIELD_STATISTICS,
   SHOW_MULTIFIELDS,
   SORT_DEFAULT_ORDER_SETTING,
-  TRUNCATE_MAX_HEIGHT,
-  TRUNCATE_MAX_HEIGHT_DEFAULT_VALUE,
   IgnoredReason,
   buildDataTableRecord,
   buildDataTableRecordList,
@@ -45,7 +42,6 @@ export {
   getMessageFieldWithFallbacks,
   getShouldShowFieldHandler,
   isNestedFieldParent,
-  isLegacyTableEnabled,
   usePager,
   calcFieldCounts,
   getLogLevelColor,

packages/kbn-discover-utils/src/constants.ts

@@ -12,7 +12,6 @@ export const CONTEXT_STEP_SETTING = 'context:step';
 export const CONTEXT_TIE_BREAKER_FIELDS_SETTING = 'context:tieBreakerFields';
 export const DEFAULT_COLUMNS_SETTING = 'defaultColumns';
 export const DOC_HIDE_TIME_COLUMN_SETTING = 'doc_table:hideTimeColumn';
-export const DOC_TABLE_LEGACY = 'doc_table:legacy';
 export const FIELDS_LIMIT_SETTING = 'fields:popularLimit';
 export const HIDE_ANNOUNCEMENTS = 'hideAnnouncements';
 export const MAX_DOC_FIELDS_DISPLAYED = 'discover:maxDocFieldsDisplayed';
@@ -26,5 +25,3 @@ export const SEARCH_ON_PAGE_LOAD_SETTING = 'discover:searchOnPageLoad';
 export const SHOW_FIELD_STATISTICS = 'discover:showFieldStatistics';
 export const SHOW_MULTIFIELDS = 'discover:showMultiFields';
 export const SORT_DEFAULT_ORDER_SETTING = 'discover:sort:defaultOrder';
-export const TRUNCATE_MAX_HEIGHT = 'truncate:maxHeight';
-export const TRUNCATE_MAX_HEIGHT_DEFAULT_VALUE = 115;

packages/kbn-discover-utils/src/utils/build_data_record.ts

@@ -17,7 +17,7 @@ import type { DataTableRecord, EsHitRecord } from '../types';
 import { getDocId } from './get_doc_id';
 
 /**
- * Build a record for data table, explorer + classic one
+ * Build a record for data grid
  * @param doc the document returned from Elasticsearch
  * @param dataView this current data view
  * @param isAnchor determines if the given doc is the anchor doc when viewing surrounding documents

packages/kbn-discover-utils/src/utils/index.ts

@@ -21,5 +21,4 @@ export * from './nested_fields';
 export * from './get_field_value';
 export * from './calc_field_counts';
 export * from './get_visible_columns';
-export { isLegacyTableEnabled } from './is_legacy_table_enabled';
 export { DiscoverFlyouts, dismissAllFlyoutsExceptFor, dismissFlyouts } from './dismiss_flyouts';

packages/kbn-discover-utils/src/utils/is_legacy_table_enabled.ts

@@ -24,7 +24,6 @@
     "@kbn/field-formats-plugin",
     "@kbn/field-types",
     "@kbn/i18n",
-    "@kbn/core-ui-settings-browser",
     "@kbn/expressions-plugin",
     "@kbn/logs-data-access-plugin",
     "@kbn/i18n-react",

packages/kbn-discover-utils/tsconfig.json

@@ -87,8 +87,6 @@ export const DISCOVER_SHOW_MULTI_FIELDS_ID = 'discover:showMultiFields';
 export const DISCOVER_SORT_DEFAULT_ORDER_ID = 'discover:sort:defaultOrder';
 export const DOC_TABLE_HIDE_TIME_COLUMNS_ID = 'doc_table:hideTimeColumn';
 export const DOC_TABLE_HIGHLIGHT_ID = 'doc_table:highlight';
-export const DOC_TABLE_LEGACY_ID = 'doc_table:legacy';
-export const TRUNCATE_MAX_HEIGHT_ID = 'truncate:maxHeight';
 
 // Machine learning settings
 export const ML_ANOMALY_DETECTION_RESULTS_ENABLE_TIME_DEFAULTS_ID =

packages/kbn-management/settings/setting_ids/index.ts

@@ -2,10 +2,6 @@
 
 This package contains components and services for the unified doc viewer component.
 
-Discover (Classic view → Expanded document)
-
-![image](https://github.com/elastic/kibana/assets/1178348/a0a360bf-2697-4427-a32e-c728f06f5a7e)
-
 Discover (Document explorer → Toggle dialog with details)
 
 ![image](https://github.com/elastic/kibana/assets/1178348/c9c11587-c53f-4bcd-8d48-aaceb64981ea)