Enable Elasticsearch to enhance the data retrieval process and to improve the search capabilities across the system. Enabling Elasticsearch re-indexes the Data and Work classes only in the Pega Foundations core layer. Therefore, if you imported sample data, you must re-index the Data and Work classes after enabling Elastic search in order to view the sample codes, sample code groups, and sample common object instances in the portals of the demo application.

1. In the header of Dev Studio, Click Records > SysAdmin > Dynamic System Settings.
2. Verify that Elastic search is enabled by checking that the value for the following dynamic settings is true:
   • indexing/distributed/enabled
   • indexing/distributed/index_enabled
   • indexing/distributed/search_enabled
   • indexing/distributed/search/fuzzy/enabled
   • indexing/useDataInstances
3. If any of the values is not set to true, click the setting and update the value, and then click Save. If any of the settings do not appear in the list, you can search for that setting. If necessary, add the setting and set the value to true.
4. Configure the number of shards for each Elastic search index and Thread pool settings by modifying the following Dynamic system settings:
   • Number of shards – Configure the number of shards for Work, Data and dedicated indices using a DASS setting:

     DASS: indexing/distributed/numshards

     Ruleset: Pega-SearchEngine

     Default: 3 (for newly created work, data and dedicated indices)

   • Threadpool settings:

     Threadpool setting	Elastic search default value	Pega's default in Embedded mode (up to 8.1)	DASS to configure
     thread_pool.index.size	# of available processors	1	indexing/distributed/index_threadpool_size
     thread_pool.search.size	Int ((# of available processors * 3) / 2) + 1	1	indexing/distributed/search_threadpool_size
     thread_pool.bulk.size	# of available processors	1	indexing/distributed/bulk_threadpool_size
     thread_pool.force_merge.size	# of available processors	-	indexing/distributed/forcemerge_threadpool_size
     thread_pool.refresh.max	Min (10, (# of available processors) /2)	-	indexing/distributed/refresh_threadpool_size

     Note:
     • Create all settings in the Pega-SearchEngine ruleset.
     • The Thread pool type used for refresh is “scaling.” The DASS sets the max size of thread pool.
     • Thread pool settings are applicable only to the Embedded mode.
5. Re-index the Data and Work classes:
   1. Click Configure > System > Settings > Search.
   2. On the Search tab, on the System Settings screen, select the All data and All work classes check boxes.
   3. Click Re-index to the right of a row to re-index that class.