ae3dc0d4b1
This set of commits introduces a new IndexAccessor SPI for the Spring Expression Language (SpEL) which allows third parties to customize the SpEL Indexer. A custom IndexAccessor implementation can be registered in a StandardEvaluationContext. For an example, see the JacksonArrayNodeIndexAccessor in IndexingTests in the spring-expression module. See gh-26409 Closes gh-26478
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