IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Flush API

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Flush API

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Flush Request

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A FlushRequest can be applied to one or more indices, or even on _all the indices:

FlushRequest request = new FlushRequest("index1"); 
FlushRequest requestMultiple = new FlushRequest("index1", "index2"); 
FlushRequest requestAll = new FlushRequest();

	Flush one index
	Flush multiple indices
	Flush all the indices

Optional arguments

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request.indicesOptions(IndicesOptions.lenientExpandOpen());

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

request.waitIfOngoing(true);

Set the wait_if_ongoing flag to true

request.force(true);

Set the force flag to true

Synchronous Execution

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FlushResponse flushResponse = client.indices().flush(request, RequestOptions.DEFAULT);

Asynchronous Execution

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The asynchronous execution of a flush request requires both the FlushRequest instance and an ActionListener instance to be passed to the asynchronous method:

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

The FlushRequest 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 FlushResponse looks like:

ActionListener<FlushResponse> listener = new ActionListener<FlushResponse>() {
    @Override
    public void onResponse(FlushResponse refreshResponse) {
        
    }

    @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

Flush Response

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

int totalShards = flushResponse.getTotalShards(); 
int successfulShards = flushResponse.getSuccessfulShards(); 
int failedShards = flushResponse.getFailedShards(); 
DefaultShardOperationFailedException[] failures = flushResponse.getShardFailures();

	Total number of shards hit by the flush request
	Number of shards where the flush has succeeded
	Number of shards where the flush has failed
	A list of failures if the operation failed on one or more shards

By default, if the indices were not found, an ElasticsearchException will be thrown:

try {
    FlushRequest request = new FlushRequest("does_not_exist");
    client.indices().flush(request, RequestOptions.DEFAULT);
} catch (ElasticsearchException exception) {
    if (exception.status() == RestStatus.NOT_FOUND) {
        
    }
}

Do something if the indices to be flushed were not found

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