### 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/IngestService.java
}
            });
        } catch (Exception e) {
            logger.debug(
                () -> format("failed to execute pipeline [%s] for document [%s/%s]", pipelineId, indexRequest.index(), indexRequest.id()),
                e
            );
            onFailure.accept(slot, e);
            if (counter.decrementAndGet() == 0) {
                onCompletion.accept(originalThread, null);
            }
            assert counter.get() >= 0;
        }
    }
    public IngestStats stats() {
        IngestStats.Builder statsBuilder = new IngestStats.Builder();
        statsBuilder.addTotalMetrics(totalMetrics);
        pipelines.forEach((id, holder) -> {
            Pipeline pipeline = holder.pipeline;
            CompoundProcessor rootProcessor = pipeline.getCompoundProcessor();
            statsBuilder.addPipelineMetrics(id, pipeline.getMetrics());
            List<Tuple<Processor, IngestMetric>> processorMetrics = new ArrayList<>();
            getProcessorMetrics(rootProcessor, processorMetrics);
            processorMetrics.forEach(t -> {
                Processor processor = t.v1();
                IngestMetric processorMetric = t.v2();
                statsBuilder.addProcessorMetrics(id, getProcessorName(processor), processor.getType(), processorMetric);
            });
        });
        return statsBuilder.build();