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The external QueryService plugin gives you the ability to browse both local and external indexes. It also gives you the ability to use external query expression/search response transformation services. “External" in this sense means a different Docker container.
Thus, you also have the possibility to use multiple indexes, but in this case, you should note that for this you need to configure the SearchResponseTransformationService, which combines the individual results (SearchResponses) of all indexes.
To install the plugin, open the Mindbreeze Management Center. Select the "Configuration" item from the left menu. Then navigate to the "Plugins" tab. In the "Plugin Management" section, select the corresponding mindbreeze.plugins.external.queryservice-<version>.tar.gz file and upload it using the "Upload" button. This will automatically install the external query service or update it if necessary.
To create or configure the service, navigate to the "Indices" tab and click the "Add Service" button in the "Services" section.
Then select the desired service "QueryServicePlugin.ExternalService".
Port on which the service can be reached.
IP address or hostname to which the service is bound.
Number of threads of the backend web server.
URLs of the Indices to query
List of indexes (specified as URL) used for the search queries.
URL of the QueryExprTransformationService
Optional URL of the QueryExprTranformationService, which can also be in a container that is called before the indexes are invoked.
URL of the SearchResponseTransformationService
Optional URL of the SearchResponseTransformationService, which can also be in a container that is called after the indices are invoked.
Note: When using multiple indexes, this service is required.
By default, JWT is used as the authentication method. However, if this is not yet supported, the OAuth2 authentication method is used instead.
OAuth token URL
The URL from which OAuth2 access tokens can be requested.
Normally: https://<server-FQDN> :8443/auth/realms/master/protocol/openid-connect/token
The OAuth User.
Password of the OAuth user.
OAuth Client ID
Client ID of the OAuth user.
In order for the service to be used in the search, it must be entered in the client service under "Federated Query Engines" (Advanced Settings).