### 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
model.put(SourceFieldMapper.NAME, sourceAndMetadata);
            
            
            model.put(INGEST_KEY, ingestMetadata);
            return model;
        });
    }
    /**
     * one time operation that extracts the metadata fields from the ingest document and returns them.
     * Metadata fields that used to be accessible as ordinary top level fields will be removed as part of this call.
     */
    public Map<Metadata, Object> extractMetadata() {
        Map<Metadata, Object> metadataMap = new EnumMap<>(Metadata.class);
        for (Metadata metadata : Metadata.values()) {
            metadataMap.put(metadata, sourceAndMetadata.remove(metadata.getFieldName()));
        }
        return metadataMap;
    }
    /**
     * Does the same thing as {@link #extractMetadata} but does not mutate the map.
     */
    public Map<Metadata, Object> getMetadata() {
        Map<Metadata, Object> metadataMap = new EnumMap<>(Metadata.class);
        for (Metadata metadata : Metadata.values()) {
            metadataMap.put(metadata, sourceAndMetadata.get(metadata.getFieldName()));
        }
        return metadataMap;
    }
    /**
     * Returns the available ingest metadata fields, by default only timestamp, but it is possible to set additional ones.