[7.17] Fix documentation for session lifespan default (elastic#198065) (

elastic#198077)

# Backport

This will backport the following commits from `main` to `7.17`:
- [Fix documentation for session lifespan default
(elastic#198065)](elastic#198065)

<!--- Backport version: 8.9.8 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Larry
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documentation for session lifespan default (elastic#198065)\n\nThis pull
request includes an update to
the\r\n`docs/settings/security-settings.asciidoc` file to clarify the
default\r\nsession lifespan settings for different installation
environments.\r\n\r\nDocumentation
update:\r\n\r\n*\r\n[`docs/settings/security-settings.asciidoc`](diffhunk://#diff-97a4c4e3696b33b246f55ddd794608530b693f0a7a66ae1361a32b67c7461523L204-R204):\r\nClarified
that the default session lifespan is 30 days for
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documentation for session lifespan default (elastic#198065)\n\nThis pull
request includes an update to
the\r\n`docs/settings/security-settings.asciidoc` file to clarify the
default\r\nsession lifespan settings for different installation
environments.\r\n\r\nDocumentation
update:\r\n\r\n*\r\n[`docs/settings/security-settings.asciidoc`](diffhunk://#diff-97a4c4e3696b33b246f55ddd794608530b693f0a7a66ae1361a32b67c7461523L204-R204):\r\nClarified
that the default session lifespan is 30 days for
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documentation for session lifespan default (elastic#198065)\n\nThis pull
request includes an update to
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default\r\nsession lifespan settings for different installation
environments.\r\n\r\nDocumentation
update:\r\n\r\n*\r\n[`docs/settings/security-settings.asciidoc`](diffhunk://#diff-97a4c4e3696b33b246f55ddd794608530b693f0a7a66ae1361a32b67c7461523L204-R204):\r\nClarified
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Fix documentation for session lifespan default (elastic#198065) (elastic#198069)\n\n#
Backport\n\nThis will backport the following commits from `main` to
`8.16`:\n- [Fix documentation for session lifespan
default\n(elastic#198065)](https://github.com/elastic/kibana/pull/198065)\n\n<!---
Backport version: 9.4.3 -->\n\n### Questions ?\nPlease refer to the
[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
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for session lifespan default (elastic#198065)\\n\\nThis pull\nrequest includes
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and 24 hours for Elastic
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Larry Gregory
<[email protected]>"}},{"branch":"8.x","label":"v8.17.0","labelRegex":"^v8.17.0$","isSourceBranch":false,"url":"https://github.com/elastic/kibana/pull/198070","number":198070,"state":"MERGED","mergeCommit":{"sha":"25795fe2ab5df586fd781642ee9dbfc59c198e9e","message":"[8.x]
Fix documentation for session lifespan default (elastic#198065) (elastic#198070)\n\n#
Backport\n\nThis will backport the following commits from `main` to
`8.x`:\n- [Fix documentation for session lifespan
default\n(elastic#198065)](https://github.com/elastic/kibana/pull/198065)\n\n<!---
Backport version: 9.4.3 -->\n\n### Questions ?\nPlease refer to the
[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
[{\"author\":{\"name\":\"Larry\nGregory\",\"email\":\"[email protected]\"},\"sourceCommit\":{\"committedDate\":\"2024-10-28T18:01:56Z\",\"message\":\"Fix\ndocumentation
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Larry Gregory
<[email protected]>"}},{"branch":"8.15","label":"v8.15.4","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"url":"https://github.com/elastic/kibana/pull/198068","number":198068,"state":"MERGED","mergeCommit":{"sha":"76dfd876288f32f3b984de6c8c9d44f95737fa18","message":"[8.15]
Fix documentation for session lifespan default (elastic#198065) (elastic#198068)\n\n#
Backport\n\nThis will backport the following commits from `main` to
`8.15`:\n- [Fix documentation for session lifespan
default\n(elastic#198065)](https://github.com/elastic/kibana/pull/198065)\n\n<!---
Backport version: 9.4.3 -->\n\n### Questions ?\nPlease refer to the
[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
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Larry Gregory <[email protected]>"}}]}] BACKPORT-->

docs/settings/security-settings.asciidoc

@@ -289,7 +289,7 @@ Use a string of `<count>[ms\|s\|m\|h\|d\|w\|M\|Y]` (e.g. '20m', '24h', '7d', '1w
 |[[xpack-session-lifespan]] `xpack.security.session.lifespan` {ess-icon}
   | Ensures that user sessions will expire after the defined time period. This behavior is also known as an "absolute timeout". If
 this is _not_ set or set to `0`, user sessions could stay active indefinitely. This and <<xpack-session-idleTimeout, `xpack.security.session.idleTimeout`>> are both highly
-recommended. You can also specify this setting for <<xpack-security-provider-session-lifespan, every provider separately>>. By default, this setting is not set.
+recommended. You can also specify this setting for <<xpack-security-provider-session-lifespan, every provider separately>>. By default, this setting is not set for on-prem, and is set to 24 hours on Elastic Cloud.
 
 2+a|
 [TIP]