### 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
private final String[] pathElements;
        private final Object initialContext;
        private FieldPath(String path) {
            if (Strings.isEmpty(path)) {
                throw new IllegalArgumentException("path cannot be null nor empty");
            }
            String newPath;
            if (path.startsWith(INGEST_KEY_PREFIX)) {
                initialContext = ingestMetadata;
                newPath = path.substring(INGEST_KEY_PREFIX.length(), path.length());
            } else {
                initialContext = sourceAndMetadata;
                if (path.startsWith(SOURCE_PREFIX)) {
                    newPath = path.substring(SOURCE_PREFIX.length(), path.length());
                } else {
                    newPath = path;
                }
            }
            this.pathElements = newPath.split("\\.");
            if (pathElements.length == 1 && pathElements[0].isEmpty()) {
                throw new IllegalArgumentException("path [" + path + "] is not valid");
            }
        }
    }
    private static class ResolveResult {