Change default session idle timeout to 3 days. (#162313)

Closes https://github.com/elastic/kibana/issues/162215

## Summary

This PR changes the default session idle timeout for users to 3 days. 

## Changes Made

- Updated default `session.idleTimeout` to `3d`. 
- Updated tests to expect the new default timeout
- Updated asciidocs to match the above change

## Release notes

Change the default value of `session.idleTimeout` from 8 hours to 3
days.

docs/CHANGELOG.asciidoc

@@ -5865,7 +5865,7 @@ The default values for the session timeout `xpack.security.session.{lifespan|idl
 *Impact* +
 Use the following default values:
 
-* `xpack.security.session.idleTimeout: 8h`
+* `xpack.security.session.idleTimeout: 3d`
 * `xpack.security.session.lifespan: 30d`
 ====
 

docs/user/security/session-management.asciidoc

@@ -12,12 +12,12 @@ To manage user sessions programmatically, {kib} exposes <<session-management-api
 ==== Session idle timeout
 
 You can use `xpack.security.session.idleTimeout` to expire sessions after a period of inactivity. This and `xpack.security.session.lifespan` are both highly recommended.
-By default, sessions expire after 8 hours of inactivity. To define another value for a sliding session expiration, set the  property in the `kibana.yml` configuration file. The idle timeout is formatted as a duration of `<count>[ms|s|m|h|d|w|M|Y]` (e.g. '20m', '24h', '7d', '1w'). For example, set the idle timeout to expire sessions after 30 minutes of inactivity:
+By default, sessions expire after 3 days of inactivity. To define another value for a sliding session expiration, set the  property in the `kibana.yml` configuration file. The idle timeout is formatted as a duration of `<count>[ms|s|m|h|d|w|M|Y]` (e.g. '20m', '24h', '7d', '1w'). For example, set the idle timeout to expire sessions after 30 minutes of inactivity:
 
 --
 [source,yaml]
 --------------------------------------------------------------------------------
-xpack.security.session.idleTimeout: "30m"
+xpack.security.session.idleTimeout: "3d"
 --------------------------------------------------------------------------------
 --
 

x-pack/plugins/security/server/config.test.ts

@@ -67,7 +67,7 @@ describe('config schema', () => {
         "secureCookies": false,
         "session": Object {
           "cleanupInterval": "PT1H",
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "P30D",
         },
         "showInsecureClusterWarning": true,
@@ -122,7 +122,7 @@ describe('config schema', () => {
         "secureCookies": false,
         "session": Object {
           "cleanupInterval": "PT1H",
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "P30D",
         },
         "showInsecureClusterWarning": true,
@@ -176,7 +176,7 @@ describe('config schema', () => {
         "secureCookies": false,
         "session": Object {
           "cleanupInterval": "PT1H",
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "P30D",
         },
         "showInsecureClusterWarning": true,
@@ -1485,7 +1485,7 @@ describe('config schema', () => {
           "concurrentSessions": Object {
             "maxSessions": 3,
           },
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "P30D",
         }
       `);
@@ -1912,7 +1912,7 @@ describe('createConfig()', () => {
       expect(createMockConfig().session.getExpirationTimeouts({ type: 'basic', name: 'basic1' }))
         .toMatchInlineSnapshot(`
         Object {
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "P30D",
         }
       `);
@@ -1962,7 +1962,7 @@ describe('createConfig()', () => {
         })
       ).toMatchInlineSnapshot(`
         Object {
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "PT0.456S",
         }
       `);
@@ -1996,7 +1996,7 @@ describe('createConfig()', () => {
           createMockConfig({ session: { lifespan: 456 } }).session.getExpirationTimeouts(provider)
         ).toMatchInlineSnapshot(`
           Object {
-            "idleTimeout": "PT8H",
+            "idleTimeout": "P3D",
             "lifespan": "PT0.456S",
           }
         `);
@@ -2077,14 +2077,14 @@ describe('createConfig()', () => {
       expect(configWithoutGlobal.session.getExpirationTimeouts({ type: 'basic', name: 'basic1' }))
         .toMatchInlineSnapshot(`
         Object {
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "PT0.654S",
         }
       `);
       expect(configWithoutGlobal.session.getExpirationTimeouts({ type: 'saml', name: 'saml1' }))
         .toMatchInlineSnapshot(`
         Object {
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "PT11M5.544S",
         }
       `);
@@ -2101,7 +2101,7 @@ describe('createConfig()', () => {
       expect(configWithGlobal.session.getExpirationTimeouts({ type: 'basic', name: 'basic1' }))
         .toMatchInlineSnapshot(`
         Object {
-          "idleTimeout": "PT8H",
+          "idleTimeout": "P3D",
           "lifespan": "PT0.654S",
         }
       `);

x-pack/plugins/security/server/config.ts

@@ -214,7 +214,7 @@ export const ConfigSchema = schema.object({
   ),
   session: schema.object({
     idleTimeout: schema.oneOf([schema.duration(), schema.literal(null)], {
-      defaultValue: schema.duration().validate('8h'),
+      defaultValue: schema.duration().validate('3d'),
     }),
     lifespan: schema.oneOf([schema.duration(), schema.literal(null)], {
       defaultValue: schema.duration().validate('30d'),

x-pack/plugins/security/server/usage_collector/security_usage_collector.test.ts

@@ -46,7 +46,7 @@ describe('Security UsageCollector', () => {
     enabledAuthProviders: ['basic'],
     loginSelectorEnabled: false,
     httpAuthSchemes: ['apikey', 'bearer'],
-    sessionIdleTimeoutInMinutes: 480,
+    sessionIdleTimeoutInMinutes: 4320,
     sessionLifespanInMinutes: 43200,
     sessionCleanupInMinutes: 60,
     sessionConcurrentSessionsMaxSessions: 0,