[Backport 7.x] Do not load SSLService in plugin contructor #50519
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XPackPlugin created an SSLService within the plugin contructor. This has 2 negative consequences: 1. The service may be constructed based on a partial view of settings. Other plugins are free to add setting values via the additionalSettings() method, but this (necessarily) happens after plugins have been constructed. 2. Any exceptions thrown during the plugin construction are handled differently than exceptions thrown during "createComponents". Since SSL configurations exceptions are relatively common, it is far preferable for them to be thrown and handled as part of the createComponents flow. This commit moves the creation of the SSLService to XPackPlugin.createComponents, and alters the sequence of some other steps to accommodate this change. Relates: elastic#44536 Backport of: elastic#49667
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XPackPlugin created an SSLService within the plugin contructor.
This has 2 negative consequences:
The service may be constructed based on a partial view of settings.
Other plugins are free to add setting values via the
additionalSettings() method, but this (necessarily) happens after
plugins have been constructed.
Any exceptions thrown during the plugin construction are handled
differently than exceptions thrown during "createComponents".
Since SSL configurations exceptions are relatively common, it is
far preferable for them to be thrown and handled as part of the
createComponents flow.
This commit moves the creation of the SSLService to
XPackPlugin.createComponents, and alters the sequence of some other
steps to accommodate this change.
Backport of: #49667