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# `lucene`

## Description

The `lucene` command executes a Lucene query within a DataPrime query, allowing users to seamlessly combine Lucene’s search syntax with DataPrime’s structured query capabilities.

This enables powerful hybrid queries—for example, filtering or aggregating over results first narrowed by a Lucene search expression.

Note

Field names inside the Lucene query are relative to `$d` (the root level of user data). You can combine Lucene search with other DataPrime commands such as `filter`, `aggregate`, or `groupby`.

## Syntax

```
lucene <lucene-query-as-a-string>
```

## Example

**Use case: Combine Lucene filtering with DataPrime analytics**

Suppose you want to retrieve only logs where the `pod` name contains “recommender” and the event either indicates an error or has a `404` status code. You can use a Lucene expression directly in your query.

### Example data

```
{ "pod": "recommender-01", "is_error": true, "status_code": 500 },

{ "pod": "checkout-02", "is_error": true, "status_code": 200 },

{ "pod": "recommender-02", "is_error": false, "status_code": 404 },

{ "pod": "auth-01", "is_error": false, "status_code": 200 }
```

### Example query

```
lucene 'pod:recommender AND (is_error:true OR status_code:404)'
```

### Example output

```
{ "pod": "recommender-01", "is_error": true, "status_code": 500 },

{ "pod": "recommender-02", "is_error": false, "status_code": 404 }
```

The `lucene` command filters logs based on Lucene syntax before passing the results to any subsequent DataPrime transformations. This makes it ideal for leveraging existing Lucene search expertise within DataPrime workflows.