### Description

This is a followup to #85926.

As part of the ingest processing pipeline, we call `CollectionUtils.ensureNoSelfReferences(...)` to ensure that a script processor didn't accidentally introduce a circular object. However, this check is only necessary if we know there was the potential for a circular option, which can only happen with either a custom processor (a plugin where we have no control), or a script processor. We should be able to only call this sanity check if we know we need it, rather than for every document.
server/src/main/java/org/elasticsearch/ingest/IngestDocument.java
}
    @Override
    public String toString() {
        return "IngestDocument{" + " sourceAndMetadata=" + sourceAndMetadata + ", ingestMetadata=" + ingestMetadata + '}';
    }
    public enum Metadata {
        INDEX(IndexFieldMapper.NAME),
        TYPE("_type"),
        ID(IdFieldMapper.NAME),
        ROUTING(RoutingFieldMapper.NAME),
        VERSION(VersionFieldMapper.NAME),
        VERSION_TYPE("_version_type"),
        IF_SEQ_NO("_if_seq_no"),
        IF_PRIMARY_TERM("_if_primary_term"),
        DYNAMIC_TEMPLATES("_dynamic_templates");
        private static final Set<String> METADATA_NAMES = Arrays.stream(Metadata.values())
            .map(metadata -> metadata.fieldName)
            .collect(Collectors.toSet());
        private final String fieldName;
        Metadata(String fieldName) {
            this.fieldName = fieldName;
        }
        public static boolean isMetadata(String field) {
            return METADATA_NAMES.contains(field);
        }
        public String getFieldName() {
            return fieldName;
        }
    }
    private class FieldPath {