Update -PinstalledPlugins documentation to reflect opensearch-security plugin requirements

[reta]

Description

Update -PinstalledPlugins documentation to reflect opensearch-security plugin requirements. Running ./gradlew run -PinstalledPlugins="['opensearch-security']" fails with:

» [2026-07-14T13:56:38,082][ERROR][o.o.b.OpenSearchUncaughtExceptionHandler] [runTask-0] fatal error in thread [main], exiting
»  java.lang.NoClassDefFoundError: org/bouncycastle/jcajce/provider/BouncyCastleFipsProvider
»       at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
»       at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:2985)
»       at java.base/java.lang.Class.getConstructors(Class.java:2025)
»       at org.opensearch.plugins.PluginsService.loadPlugin(PluginsService.java:906)
»       at org.opensearch.plugins.PluginsService.loadBundle(PluginsService.java:874)
»       at org.opensearch.plugins.PluginsService.loadBundles(PluginsService.java:657)
»       at org.opensearch.plugins.PluginsService.<init>(PluginsService.java:227)
»       at org.opensearch.node.Node.<init>(Node.java:576)
»       at org.opensearch.node.Node.<init>(Node.java:504)
»       at org.opensearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:264)
»       at org.opensearch.bootstrap.Bootstrap.setup(Bootstrap.java:264)
»       at org.opensearch.bootstrap.Bootstrap.init(Bootstrap.java:426)
»       at org.opensearch.bootstrap.OpenSearch.init(OpenSearch.java:168)
»       at org.opensearch.bootstrap.OpenSearch.execute(OpenSearch.java:159)
»       at org.opensearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:110)
»       at org.opensearch.cli.Command.mainWithoutErrorHandling(Command.java:138)
»       at org.opensearch.cli.Command.main(Command.java:101)
»       at org.opensearch.bootstrap.OpenSearch.main(OpenSearch.java:125)
»       at org.opensearch.bootstrap.OpenSearch.main(OpenSearch.java:91)
»  Caused by: java.lang.ClassNotFoundException: org.bouncycastle.jcajce.provider.BouncyCastleFipsProvider

Setting crypto.standard explicitly eliminates the issue: ./gradlew run -PinstalledPlugins="['opensearch-security']" -Pcrypto.standard=FIPS-140-3 (since BC dependencies are going to be bundled).

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

PR Reviewer Guide 🔍

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🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

[github-actions]

✅ Gradle check result for 2c53a09: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.42%. Comparing base (d69286a) to head (2c53a09).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #22469      +/-   ##
============================================
- Coverage     73.44%   73.42%   -0.03%     
+ Complexity    76488    76445      -43     
============================================
  Files          6104     6104              
  Lines        346576   346578       +2     
  Branches      49885    49886       +1     
============================================
- Hits         254558   254482      -76     
- Misses        71736    71836     +100     
+ Partials      20282    20260      -22     

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