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Update Indices Settings API

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Update Indices Settings API

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The Update Indices Settings API allows to change specific index level settings.

Update Indices Settings Request

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An UpdateSettingsRequest:

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

	Update settings for one index
	Update settings for multiple indices
	Update settings for all indices

Indices Settings

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At least one setting to be updated must be provided:

String settingKey = "index.number_of_replicas";
int settingValue = 0;
Settings settings =
        Settings.builder()
        .put(settingKey, settingValue)
        .build();

Sets the index settings to be applied

Providing the Settings

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The settings to be applied can be provided in different ways:

String settingKey = "index.number_of_replicas";
int settingValue = 0;
Settings settings =
        Settings.builder()
        .put(settingKey, settingValue)
        .build();

Creates a setting as Settings

Settings.Builder settingsBuilder =
        Settings.builder()
        .put(settingKey, settingValue);
request.settings(settingsBuilder);

Settings provided as Settings.Builder

request.settings(
        "{\"index.number_of_replicas\": \"2\"}"
        , XContentType.JSON);

Settings provided as String

Map<String, Object> map = new HashMap<>();
map.put(settingKey, settingValue);
request.settings(map);

Settings provided as a Map

Optional Arguments

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The following arguments can optionally be provided:

request.setPreserveExisting(false);

Whether to update existing settings. If set to true existing settings on an index remain unchanged, the default is false

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

	Timeout to wait for the all the nodes to acknowledge the new setting as a `TimeValue`
	Timeout to wait for the all the nodes to acknowledge the new setting 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.indicesOptions(IndicesOptions.lenientExpandOpen());

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

Synchronous Execution

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UpdateSettingsResponse updateSettingsResponse =
        client.indices().putSettings(request, RequestOptions.DEFAULT);

Asynchronous Execution

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The asynchronous execution of an indices update settings requires both the UpdateSettingsRequest instance and an ActionListener instance to be passed to the asynchronous method:

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

The UpdateSettingsRequest 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 UpdateSettingsResponse looks like:

ActionListener<UpdateSettingsResponse> listener =
        new ActionListener<UpdateSettingsResponse>() {

    @Override
    public void onResponse(UpdateSettingsResponse updateSettingsResponse) {
        
    }

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

	Called when the execution is successfully completed. The response is provided as an argument
	Called in case of a failure. The raised exception is provided as an argument

Update Indices Settings Response

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

boolean acknowledged = updateSettingsResponse.isAcknowledged();

Indicates whether all of the nodes have acknowledged the request

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