### 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
* existing (or newly created) list.
     * @param path The path within the document in dot-notation
     * @param value The value or values to append to the existing ones
     * @throws IllegalArgumentException if the path is null, empty or invalid.
     */
    public void appendFieldValue(String path, Object value) {
        appendFieldValue(path, value, true);
    }
    /**
     * Appends the provided value to the provided path in the document.
     * Any non existing path element will be created.
     * If the path identifies a list, the value will be appended to the existing list.
     * If the path identifies a scalar, the scalar will be converted to a list and
     * the provided value will be added to the newly created list.
     * Supports multiple values too provided in forms of list, in that case all the values will be appended to the
     * existing (or newly created) list.
     * @param path The path within the document in dot-notation
     * @param value The value or values to append to the existing ones
     * @param allowDuplicates When false, any values that already exist in the field will not be added
     * @throws IllegalArgumentException if the path is null, empty or invalid.
     */
    public void appendFieldValue(String path, Object value, boolean allowDuplicates) {
        setFieldValue(path, value, true, allowDuplicates);
    }
    /**
     * Appends the provided value to the provided path in the document.
     * Any non existing path element will be created.
     * If the path identifies a list, the value will be appended to the existing list.
     * If the path identifies a scalar, the scalar will be converted to a list and
     * the provided value will be added to the newly created list.