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* Setting `script.painless.regex.enabled` has a new option, `use-factor`, the default. This defaults to using regular expressions but limiting the complexity of the regular expressions. In addition to `use-factor`, the setting can be `true`, as before, which enables regular expressions without limiting them. `false` totally disables regular expressions, which was the old default. * New setting `script.painless.regex.limit-factor`. This limits regular expression complexity by limiting the number characters a regular expression can consider based on input length. The default is `6`, so a regular expression can consider `6` * input length number of characters. With input `foobarbaz` (length `9`), for example, the regular expression can consider `54` (`6 * 9`) characters. This reduces the impact of exponential backtracking in Java's regular expression engine. * add `@inject_constant` annotation to whitelist. This annotation signals that a compiler settings will be injected at the beginning of a whitelisted method. The format is `argnum=settingname`: `1=foo_setting 2=bar_setting`. Argument numbers must start at one and must be sequential. * Augment `Pattern.split(CharSequence)` `Pattern.split(CharSequence, int)`, `Pattern.splitAsStream(CharSequence)` `Pattern.matcher(CharSequence)` to take the value of `script.painless.regex.limit-factor` as a an injected parameter, limiting as explained above when this setting is in use. Fixes: #49873 Backport of: 93f29a4