We get the following error when opening fleet page after upgrading from 7.10.2 to 7.11:
Unable to initialize Fleet
[illegal_argument_exception] updating component template [logs-endpoint.events.file-mappings] results in invalid composable template [logs-endpoint.events.file] after templates are merged response from /_component_template/logs-endpoint.events.file-mappings: {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"updating component template [logs-endpoint.events.file-mappings] results in invalid composable template [logs-endpoint.events.file] after templates are merged"}],"type":"illegal_argument_exception","reason":"updating component template [logs-endpoint.events.file-mappings] results in invalid composable template [logs-endpoint.events.file] after templates are merged","caused_by":{"type":"illegal_argument_exception","reason":"template [logs-endpoint.events.file] has alias and data stream definitions"}},"status":400}
Use the Autoindent feature in dev tools so you’re sure the JSON has balanced brackets.
Go back to the Fleet UI, which will show the same error but for another composable template. Repeat these steps until the Fleet UI comes up normally again.
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