### 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
}
            } else if (indexRequest.index() != null) {
                
                
                
                String v2Template = MetadataIndexTemplateService.findV2Template(metadata, indexRequest.index(), false);
                if (v2Template != null) {
                    Settings settings = MetadataIndexTemplateService.resolveSettings(metadata, v2Template);
                    if (IndexSettings.DEFAULT_PIPELINE.exists(settings)) {
                        defaultPipeline = IndexSettings.DEFAULT_PIPELINE.get(settings);
                        
                    }
                    if (IndexSettings.FINAL_PIPELINE.exists(settings)) {
                        finalPipeline = IndexSettings.FINAL_PIPELINE.get(settings);
                        
                    }
                    indexRequest.setPipeline(Objects.requireNonNullElse(defaultPipeline, NOOP_PIPELINE_NAME));
                    indexRequest.setFinalPipeline(Objects.requireNonNullElse(finalPipeline, NOOP_PIPELINE_NAME));
                } else {
                    List<IndexTemplateMetadata> templates = MetadataIndexTemplateService.findV1Templates(
                        metadata,
                        indexRequest.index(),
                        null
                    );
                    
                    for (final IndexTemplateMetadata template : templates) {
                        final Settings settings = template.settings();
                        if (defaultPipeline == null && IndexSettings.DEFAULT_PIPELINE.exists(settings)) {
                            defaultPipeline = IndexSettings.DEFAULT_PIPELINE.get(settings);