49a0aaa793
Fixes: #9383 Issue link: https://github.com/spring-projects/spring-integration/issues/9383 * Polish `JsonPropertyAccessor[Tests]` * Introduce `JsonIndexAccessor` This commit introduces a `JsonIndexAccessor` as a complement to the existing `JsonPropertyAccessor`. When a `JsonIndexAccessor` is registered with the SpEL `EvaluationContext`, JSON arrays can be consistently indexed via integer literals (e.g.,[1]) instead of string literals representing integers (e.g., ['1']).