---
title: Query pipelines in the Search API
slug: '1450'
canonical_url: https://docs.coveo.com/en/1450/
collection: tune-relevance
source_format: adoc
---
# Query pipelines in the Search API
A [query pipeline](https://docs.coveo.com/en/180/) is a set of [statements](https://docs.coveo.com/en/236/) which define how [queries](https://docs.coveo.com/en/231/) and other operations should be executed.
Among others, the operations performed by the statements using the query pipeline include:

* Pre-processing and post-processing the query
* Defining [query extensions](https://docs.coveo.com/en/1397/)
* Defining a [thesaurus](https://docs.coveo.com/en/2742/)
* Adding [query ranking expressions (QREs)](https://docs.coveo.com/en/1472/) to the query
* Adding featured results to the query

These statements are defined using the [Query Pipeline Language](https://docs.coveo.com/en/1449/).
When a pipeline is modified, it's automatically reloaded for the next query.

## Query pipeline features

A query pipeline feature is a type of action or [Coveo Machine Learning (Coveo ML)](https://docs.coveo.com/en/188/) [model](https://docs.coveo.com/en/1012/) association that can be expressed through specific [query pipeline language (QPL)](https://docs.coveo.com/en/235/) syntax in a [query pipeline statement](https://docs.coveo.com/en/236/) definition.
Query pipeline features have different names in the Search API and [Coveo Administration Console](https://docs.coveo.com/en/1841/):

[%header,cols="1,2"]
|===
| Search API | Coveo Administration Console

| `queryParamOverride`
| **Query parameters**

| `thesaurus`
| **Thesaurus**

| `stop`
| **Stop Words**

| `filter`
| **Filters**

| `resultRankings`
| **Ranking Expressions**

| `resultRankings`
| **Featured Results**

| `rankingWeight`
| **Ranking Weights**

| `recommendation`
| **Machine Learning - Content Recommendations**

| `topClicks`
| **Machine Learning - Automatic Relevance Tuning**

| `querySuggest`
| **Machine Learning - Query Suggestions**

| `trigger`
| **Triggers**
|===