# dropIndex()

This operation drops an index from a specific collection.

```java
public void dropIndex(DropIndexReq request)
```

## Request Syntax

```java
dropIndex(DropIndexReq.builder()
    .collectionName(String collectionName)
    .fieldName(String fieldName)
    .indexName(String indexName)
    .build()
)
```

**BUILDER METHODS:**

- `collectionName(String collectionName)`

    The name of an existing collection.

- `fieldName(String fieldName)`

    The name of the field on which the index is created.

- `indexName(String indexName)`

    The name of the index to drop.

**RETURNS:**

*void*

**EXCEPTIONS:**

- **MilvusClientExceptions**

    This exception will be raised when any error occurs during this operation.

## Example

```java
import io.milvus.v2.client.ConnectConfig;
import io.milvus.v2.client.MilvusClientV2;
import io.milvus.v2.service.index.request.DropIndexReq;

// 1. Set up a client
ConnectConfig connectConfig = ConnectConfig.builder()
        .uri("http://localhost:19530")
        .token("root:Milvus")
        .build();
        
MilvusClientV2 client = new MilvusClientV2(connectConfig);

// 2. Drop index for the field "vector"
DropIndexReq dropIndexReq = DropIndexReq.builder()
        .collectionName("test")
        .fieldName("vector")
        .build();
client.dropIndex(dropIndexReq);
```