This functionality is experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.
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First, you’ll need to choose ODBC as the source to load data from. Once launched, click on the More… menu item and in the expanded list of connectors, choose Other Databases (ODBC):
In the new connection window that appears, select the previously configured DSN that will connect to the desired Elasticsearch instance. Press the Connect button. In case credentials are needed, a new windows - driver’s DSN editor - will be launched and you’ll need to provide the Username and Password in the respective fields. (Note that these will not be stored as part of the DSN, but only remembered for the duration of the session). If the connection is successful, the Connection Attributes section of the connection window is populated with the respective details; press the Sign In button next:
In Tableau Desktop’s main window then choose the name of Elasticsearch instance as the Database, select one table that you’d like to load from the list (click on the magnifying glass icon to have them all shown), drag the table over the work area, then click the Update Now button to load a preview of the table: