Refactor: use String.replace instead of replaceAll

[kn4tti]

Summary

Use String#replace instead of String#replaceAll for simple, non-regex replacements in PathIndexResolver to avoid unnecessary regex overhead and clarify the intent.

Details

• For map properties, replace
  path.replaceAll("\[", "").replaceAll("\]", "")
  with
  path.replace("[", "").replace("]", "").
• For collection-like properties, keep the regex-based index removal but replace the non-regex ".." handling:
  path.replaceAll("\[(\p{Digit})\]", "").replaceAll("\.\.", ".")
  becomes
  path.replaceAll("\[(\p{Digit})\]", "").replace("..", ".").

This change is intended to be behavior-preserving while simplifying the implementation and avoiding regex processing where it is not required.

Testing

• Existing tests continue to pass.