describeIndex()

A MilvusClient interface. This method shows the information of a specified index.

R<DescribeIndexResponse> describeIndex(DescribeIndexParam requestParam);

DescribeIndexParam

Use the DescribeIndexParam.Builder to construct a DescribeIndexParam object.

import io.milvus.param.DescribeIndexParam;
DescribeIndexParam.Builder builder = DescribeIndexParam.newBuilder();

Methods of DescribeIndexParam.Builder:

Method	Description	Parameters
withCollectionName(collectionName)	Sets the collection name. The collection name cannot be empty or null.	collectionName: The name of the collection whose index information needs to be checked.
withIndexName(String indexName)	Sets the target index name. The index name cannot be empty or null. If no index name is specified, the default index name is an empty string.	indexName: Name of the index whose information needs to be checked.
build()	Constructs a DescribeIndexParam object.	N/A

The DescribeIndexParam.Builder.build() could throw the following exceptions:

• ParamException: error if the parameter is invalid.

Returns

This method catches all the exceptions and returns an R<DescribeIndexResponse> object.

• If the API fails on the server side, it returns the error code and message from the server.

• If the API fails by RPC exception, it returns R.Status.Unknow and the error message of the exception.

• If the API succeeds, it returns a valid DescribeIndexResponse held by the R template. You can use DescIndexResponseWrapper to get index descriptions easily.

DescIndexResponseWrapper

A tool class to encapsulate the DescribeIndexResponse.

import io.milvus.response.DescIndexResponseWrapper;
DescIndexResponseWrapper wrapper = new DescIndexResponseWrapper(descIndexResponse);

Methods of DescIndexResponseWrapper:

Method	Description	Parameters	Returns
getIndexDescriptions()	Gets a list of all index descriptions. Currently, only the information of one index can be returned.	N/A	List<IndexDesc>
getIndexDescByFieldName(String fieldName)	Gets index description by field name. null is returned if the field does not exist.	fieldName: A field name.	IndexDesc

IndexDesc

A tool class to describe an index.

Methods of DescIndexResponseWrapper.IndexDesc:

Method	Description	Returns
getIndexType()	Gets the index type.	IndexType
getMetricType()	Gets the metric type	MetricType
getExtraParam()	Gets the index parameters in JSON format.	String

Example

import io.milvus.param.*;
import io.milvus.response.DescIndexResponseWrapper;
import io.milvus.grpc.DescribeIndexResponse;

DescribeIndexParam param = DescribeIndexParam.newBuilder()
        .withCollectionName("collection1")
        .withIndexName("index1")
        .build();
R<DescribeIndexResponse> response = client.describeIndex(param)
if (response.getStatus() != R.Status.Success.getCode()) {
    System.out.println(response.getMessage());
}

DescIndexResponseWrapper wrapper = new DescIndexResponseWrapper(response.getData());
for (DescIndexResponseWrapper.IndexDesc desc : wrapper.getIndexDescriptions()) {
    System.out.println(desc.toString());
}