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Elastic Docs ›Java REST Client [6.4] ›Java High Level REST Client ›Indices APIs

Open Index API

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Open Index API

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Open Index Request

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An OpenIndexRequest requires an index argument:

OpenIndexRequest request = new OpenIndexRequest("index");

The index to open

Optional arguments

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The following arguments can optionally be provided:

request.timeout(TimeValue.timeValueMinutes(2)); 
request.timeout("2m");

Timeout to wait for the all the nodes to acknowledge the index is opened as a TimeValue

Timeout to wait for the all the nodes to acknowledge the index is opened as a String

 
request.masterNodeTimeout(TimeValue.timeValueMinutes(1)); 
request.masterNodeTimeout("1m");

Timeout to connect to the master node as a TimeValue

Timeout to connect to the master node as a String

 
request.waitForActiveShards(2); 
request.waitForActiveShards(ActiveShardCount.ONE);

The number of active shard copies to wait for before the open index API returns a response, as an int

The number of active shard copies to wait for before the open index API returns a response, as an ActiveShardCount

 
request.indicesOptions(IndicesOptions.strictExpandOpen());

Setting IndicesOptions controls how unavailable indices are resolved and how wildcard expressions are expanded

Synchronous Execution

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OpenIndexResponse openIndexResponse = client.indices().open(request, RequestOptions.DEFAULT);

Asynchronous Execution

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The asynchronous execution of an open index request requires both the OpenIndexRequest instance and an ActionListener instance to be passed to the asynchronous method:

client.indices().openAsync(request, RequestOptions.DEFAULT, listener);

The OpenIndexRequest to execute and the ActionListener to use when the execution completes

The asynchronous method does not block and returns immediately. Once it is completed the ActionListener is called back using the onResponse method if the execution successfully completed or using the onFailure method if it failed.

A typical listener for OpenIndexResponse looks like:

ActionListener<OpenIndexResponse> listener =
        new ActionListener<OpenIndexResponse>() {
    @Override
    public void onResponse(OpenIndexResponse openIndexResponse) {
        
    }

    @Override
    public void onFailure(Exception e) {
        
    }
};

Called when the execution is successfully completed. The response is provided as an argument

Called in case of failure. The raised exception is provided as an argument

Open Index Response

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The returned OpenIndexResponse allows to retrieve information about the executed operation as follows:

boolean acknowledged = openIndexResponse.isAcknowledged(); 
boolean shardsAcked = openIndexResponse.isShardsAcknowledged();

Indicates whether all of the nodes have acknowledged the request

Indicates whether the requisite number of shard copies were started for each shard in the index before timing out
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