---
title: Troubleshoot Ingest pipelines
description: Elasticsearch Ingest Pipelines allow you to transform data during ingest. Per write model, they run from ingest node roles under the write thread pool...
url: https://www.elastic.co/docs/troubleshoot/elasticsearch/troubleshoot-ingest-pipelines
products:
  - Elasticsearch
applies_to:
  - Elastic Stack: Generally available
---

# Troubleshoot Ingest pipelines
Elasticsearch [Ingest Pipelines](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines) allow you to transform data during ingest. Per [write model](https://www.elastic.co/docs/deploy-manage/distributed-architecture/reading-and-writing-documents#basic-write-model), they run from `ingest` [node roles](https://www.elastic.co/docs/deploy-manage/distributed-architecture/clusters-nodes-shards/node-roles) under the `write` [thread pool](https://www.elastic.co/docs/reference/elasticsearch/configuration-reference/thread-pool-settings).
You can edit ingest pipelines in Kibana's **Ingest Pipelines** management page or from Elasticsearch's [Modify Pipeline API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-put-pipeline). They store under Elasticsearch's [cluster state](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-cluster-state) as accessed from [List Pipelines](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-get-pipeline).
Ingest pipelines can be [Simulated](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-simulate) during testing, but after go-live are triggered during event ingest from
- The query parameter `pipeline` flag the [create doc](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-create) or [update doc](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-update) or [bulk modify docs](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-bulk) API request.
- The ingest target's backing [index setting](https://www.elastic.co/docs/reference/elasticsearch/index-settings/index-modules#dynamic-index-settings) for `index.default_pipeline` and/or `index.final_pipeline`.
- An Ingest Pipeline may sub-call another as a [pipeline processor](https://www.elastic.co/docs/reference/enrich-processor/pipeline-processor).


## Symptoms

You might notice an Ingest Pipeline is not running as performant as possible under load testing from one of the following symptoms.

### High CPU usage

While running, if Ingest Pipelines cause [high CPU usage](https://www.elastic.co/docs/troubleshoot/elasticsearch/high-cpu-usage), their logger `org.elasticsearch.ingest.Pipeline` will show under [Node Hot Threads](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-nodes-hot-threads). An example output might prefix like this:
```text
::: {instance-0000000001}{XXXXX}{XXXXX}{instance-0000000001}{XXXXX}{XXXXX}{hirst}{9.0.0}{XXXXX}{XXXXX}
   Hot threads at XXXXX, interval=500ms, busiestThreads=10000, ignoreIdleThreads=true:

   100.0% [cpu=98.9%, other=1.1%] (500ms out of 500ms) cpu usage by thread 'elasticsearch[instance-0000000001][write][T#8]'

     10/10 snapshots sharing following 93 elements
       app/org.elasticsearch.server@9.0.0/org.elasticsearch.ingest.CompoundProcessor.execute(CompoundProcessor.java:145)
       app/org.elasticsearch.server@9.0.0/org.elasticsearch.ingest.Pipeline.execute(Pipeline.java:129)
```

The most common sub-processor to flag is a [Script processor](https://www.elastic.co/docs/reference/enrich-processor/script-processor) running [Painless](https://www.elastic.co/docs/reference/scripting-languages/painless/painless) as noted by logger `org.elasticsearch.painless`.

### Task Queue

A non-performant Ingest Pipeline may cause a [Task Queue Backlog](https://www.elastic.co/docs/troubleshoot/elasticsearch/task-queue-backlog) potentially with [Hot Spotting](https://www.elastic.co/docs/troubleshoot/elasticsearch/hotspotting). Once sufficiently severe it would start causing [Rejected Requests](https://www.elastic.co/docs/troubleshoot/elasticsearch/rejected-requests#check-rejected-tasks).

### Delayed timestamps

There can be multiple timestamps associated with a single data event. By default in Elastic-built [Integrations](https://www.elastic.co/docs/reference/integrations), every event [records](https://www.elastic.co/docs/reference/ecs/ecs-principles-implementation#_timestamps) the following:
- `@timestamp` for when an event originated.
- `event.created` for when an event first reached an Elastic product.
- `event.ingested` for when an event finished processing through an Elasticsearch Ingest Pipeline.

Kibana [Data Views](https://www.elastic.co/docs/explore-analyze/find-and-organize/data-views) default to `@timestamp` to fit most user's default expectations. While troubleshooting ingestion lag, we recommend creating a temporary Data View based on `event.ingested`.
This potential timing difference is why Security Detection Rules allow for [setting a "Timestamp override"](https://www.elastic.co/docs/troubleshoot/security/detection-rules#troubleshoot-ingestion-pipeline-delay) which defaults to `event.ingested` when enabled.
For user-managed Ingest Pipelines, you can create similar functionality by adding [Set Processor](https://www.elastic.co/docs/reference/enrich-processor/set-processor) to the end of your Ingest Pipeline. As a simplified example if `event.ingested` is not already being set upstream in your data pipeline:
```json

{
  "processors": [
    {
      "set": {
        "description": "Log the event's ingestion timestamp as 'event.ingested'",
        "field": "event.ingested",
        "value": "{{{_ingest.timestamp}}}"
      }
    }
  ]
}
```

This will update every time the event is modifed when passing through pipeline. If you need to troubleshoot the original event creation only and the field `event.created` is not already being set upstream in your data pipeline you might consider adding this processor example at the beginning of the first Ingest Pipeline:
```json

{
  "processors": [
    {
      "set": {
        "description": "Log the event's first ingest timestamp as 'event.created', does not modify for updates.",
        "field": "event.created",
        "value": "{{{_ingest.timestamp}}}",
        "override": false
      }
    }
  ]
}
```


### Errors

The Elasticsearch API response body includes errors encountered at any stage of the ingestion flow. To diagnose ingestion issues, it's also recommended to review error logs. Elastic client-side products, including [Logstash](https://www.elastic.co/docs/reference/logstash/logging#_update_logging_levels) and [Elastic Agent](https://www.elastic.co/docs/reference/fleet/monitor-elastic-agent#change-logging-level), might require the `debug` logging level to be enabled to report HTTP 400-level errors.
To demonstrate a common example, a document can be rejected from indexing due to a [mapping](https://www.elastic.co/docs/manage-data/data-store/mapping) conflict when the incoming data does not match the [explicit field types](https://www.elastic.co/docs/manage-data/data-store/mapping/explicit-mapping) defined inside the existing index's mapping. The Elasticsearch logs might include entries such as:
```json
[index] Error while parsing document for index [index]: [1:852] object mapping for [field] tried to parse field [field] as object, but found a concrete value at org.elasticsearch.index.mapper.DocumentParser.throwOnConcreteValue(DocumentParser.java:359)
```


## Metrics

When Ingest Pipelines run, they log their cumulative statistics to [List Node Statistics](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-nodes-stats).
```json
```

This reports the overall Ingest Pipelines's statistics as well as statistics for each of its processors. If a pipeline calls a sub-pipeline the parent's statistics will record the total time and not subtract time spent waiting on the other.
Storing this output into `nodes_stats.json` and then using [third-party tool JQ](https://jqlang.github.io/jq/) to parse through this JSON, some common views reported during troubleshooting include:
- Ingest Pipeline's processor has more than 10% failed events
  ```bash
  $ cat nodes_stats.json | jq -c '.nodes[]|.name as $node| .ingest.pipelines|to_entries[]| .key as $pipeline| .value.processors[] | to_entries[]|.key as $process| { pipeline:$pipeline, process:$process, node:$node, total:.value.stats.count, failed:.value.stats.failed, failed_percent:(try (100*.value.stats.failed/.value.stats.count|round) catch 0)}| select(.total>0 and .failed_percent>10)'
  ```
  Especially where `ignore_failure` is enabled, this might reflect an incomplete setup or wasted processing time.
- Ingest Pipeline's time per event is above 60 milliseconds or 1 second
  ```bash
  $ cat nodes_stats.json | jq -rc '.nodes[]|.name as $n| .ingest.pipelines|to_entries[]| .key as $pi|.value| { name:$n, pipeline:$pi, total_count:.count, total_millis:.time_in_millis, total_failed:.failed }| select(.total_count>0)|.+{time_per:(.total_millis/.total_count|round)}|select(.time_per>60)'
  ```
- Ingest Pipeline processor's time per event if it's processed at least 1 event and takes more than 0 milliseconds after rounding
  ```bash
  $ cat nodes_stats.json | jq -rc '.nodes[]|.name as $n| .ingest.pipelines|to_entries[]| .key as $pi|.value.processors[]| to_entries[]|.key as $pr| .value.stats|{ name:$n, pipeline:$pi, processor:$pr, total_count:.count, total_millis:.time_in_millis, total_failed:.failed }|select(.total_count>0)|.+{time_per:(.total_millis/.total_count|round)}|select(.time_per>0)'
  ```

Elasticsearch's Ingest Pipeline processors don't have associated `id` like Logstash's Pipelines to distinguish them so these emit in sequential order as seen in pipeline's definition.
The statistics report per node since its uptime, so will reset with node restarts. As a rough heuristic, you could look at an individual node's output knowing proportions will usually be about equal.