Deprecate Search Sessions config (#188037)

## Summary

Part of #186334.

Deprecates the config settings for the Search Sessions feature.


![image](https://github.com/elastic/kibana/assets/1178348/3ae9ec39-1a66-468c-86bc-dd9dfe6d6ef8)

### Release note

Config related to Search Sessions (`data.search.sessions.*`) is
deprecated and will be removed in a future version.

src/plugins/data/server/config_deprecations.test.ts

@@ -61,6 +61,7 @@ describe('Config Deprecations', () => {
     expect(messages).toMatchInlineSnapshot(`
       Array [
         "Setting \\"xpack.data_enhanced.search.sessions\\" has been replaced by \\"data.search.sessions\\"",
+        "Configuring \\"data.search.sessions.enabled\\" is deprecated and will be removed in 9.0.0.",
       ]
     `);
   });
@@ -101,6 +102,7 @@ describe('Config Deprecations', () => {
         "You no longer need to configure \\"data.search.sessions.expireInterval\\".",
         "You no longer need to configure \\"data.search.sessions.monitoringTaskTimeout\\".",
         "You no longer need to configure \\"data.search.sessions.notTouchedInProgressTimeout\\".",
+        "Configuring \\"data.search.sessions.enabled\\" is deprecated and will be removed in 9.0.0.",
       ]
     `);
   });
@@ -144,6 +146,7 @@ describe('Config Deprecations', () => {
         "You no longer need to configure \\"data.search.sessions.expireInterval\\".",
         "You no longer need to configure \\"data.search.sessions.monitoringTaskTimeout\\".",
         "You no longer need to configure \\"data.search.sessions.notTouchedInProgressTimeout\\".",
+        "Configuring \\"data.search.sessions.enabled\\" is deprecated and will be removed in 9.0.0.",
       ]
     `);
   });

src/plugins/data/server/config_deprecations.ts

@@ -8,17 +8,30 @@
 
 import type { ConfigDeprecationProvider } from '@kbn/core/server';
 
+const level = 'warning';
+
 export const configDeprecationProvider: ConfigDeprecationProvider = ({
   renameFromRoot,
   unusedFromRoot,
+  deprecateFromRoot,
 }) => [
   renameFromRoot('xpack.data_enhanced.search.sessions', 'data.search.sessions', {
-    level: 'warning',
+    level,
   }),
-  unusedFromRoot('data.search.sessions.pageSize', { level: 'warning' }),
-  unusedFromRoot('data.search.sessions.trackingInterval', { level: 'warning' }),
-  unusedFromRoot('data.search.sessions.cleanupInterval', { level: 'warning' }),
-  unusedFromRoot('data.search.sessions.expireInterval', { level: 'warning' }),
-  unusedFromRoot('data.search.sessions.monitoringTaskTimeout', { level: 'warning' }),
-  unusedFromRoot('data.search.sessions.notTouchedInProgressTimeout', { level: 'warning' }),
+  unusedFromRoot('data.search.sessions.pageSize', { level }),
+  unusedFromRoot('data.search.sessions.trackingInterval', { level }),
+  unusedFromRoot('data.search.sessions.cleanupInterval', { level }),
+  unusedFromRoot('data.search.sessions.expireInterval', { level }),
+  unusedFromRoot('data.search.sessions.monitoringTaskTimeout', { level }),
+  unusedFromRoot('data.search.sessions.notTouchedInProgressTimeout', { level }),
+
+  // Search sessions config deprecations
+  deprecateFromRoot('data.search.sessions.enabled', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.notTouchedTimeout', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.maxUpdateRetries', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.defaultExpiration', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.management.maxSessions', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.management.refreshInterval', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.management.refreshTimeout', '9.0.0', { level }),
+  deprecateFromRoot('data.search.sessions.management.expiresSoonWarning', '9.0.0', { level }),
 ];