Index Template

Overview

Elasticsearch presets an index template using a self-developed plug-in to facilitate user operations. You can modify the index template parameters when using the index template. The name of the index template provided by Elasticsearch is bigdata_default_template. For details, see Table 1.

**Table 1** Index template parameters
Parameter	Default Value	Description
order	0	Index template priority, which is not displayed and cannot be modified.
index_patterns	["*"]	Wildcard characters used to match the index, which are not displayed and cannot be modified.
index.template.enable	true	Indicates whether to enable the index template. The value is true or false.
settings.index.refresh_interval	60s	Refresh rate of indices, which can be modified. The value ranges from 1 to 3000, in seconds.
settings.index.search.slowlog.threshold.query.warn	10s	Threshold. Logs of the WARN level are printed when the query duration exceeds the threshold. The value can be modified. The value ranges from 1 to 3000, in seconds.
settings.index.search.slowlog.threshold.query.info	5s	Threshold. Logs of the INFO level are printed when the query duration exceeds the threshold. The value can be modified. The value ranges from 1 to 3000, in seconds.
settings.index.search.slowlog.threshold.query.debug	2s	Threshold. Logs of the DEBUG level are printed when the query duration exceeds the threshold. The value can be modified. The value ranges from 1 to 3000, in seconds.
settings.index.search.slowlog.threshold.query.trace	500ms	Threshold. Logs of the TRACE level are printed when the query duration exceeds the threshold. The value can be modified. The value ranges from 1 to 3000, in seconds or milliseconds.
settings.index.unassigned.node_left.delayed_timeout	10m	Delay in allocating shards after an instance leaves the cluster. The value can be modified. The value ranges from 1 to 3000, in minutes.

Index Template Usage

Log in to Manager.
Choose Cluster > Name of the desired cluster > Services > Elasticsearch > Configurations > All Configurations.

All index template service operations can take effect dynamically. You do not need to restart the Elasticsearch service.
Perform service operations as required. The index template supports the following service operations:
1. Enable or disable the index template
  Select Index Template.
  - To disable the index template, set the value of index.template.enable to false.
  - To enable the index template, set the value of index.template.enable to true.
1. Modify default parameters
  Select Index Template and modify default parameters based on service requirements.
  
  You are advised to retain the default values of the index template parameters.
1. Adding custom parameters
  Select Custom, change the value of elasticsearch.index.template.configs, and add the parameter name and value.
  
  Ensure that the input custom index template parameter is correct. If the input is incorrect, the configuration will fail to be saved and the Elasticsearch service cannot be started.
After the modification, click Save in the upper left corner. In the dialog box displayed, click OK.