Some indexed tracks are failing to validate in production

[mutantmonkey]

A DJ reported that some indexed tracks are failing to validate. Investigation revealed that certain track URLs are triggering elasticsearch.exceptions.RequestError (see example URLs on Slack):

elasticsearch.exceptions.RequestError: RequestError(400, 'search_phase_execution_exception', 'Failed to parse query [filename redacted]]'

We should do the following:

• Catch Elasticsearch RequestError exceptions so that validation doesn't fail just because of Elasticsearch errors
• Figure out why these URLs are causing the exception and fix the underlying issue.