The /breakdown service is occasionally returning an empty response

[adam-collins]

Two examples of the faulty URL.

• https://biocache-ws.ala.org.au/ws/breakdown?q=cl10925%3A%22NORTHERN+TERRITORY%22&fq=rank:(species%20OR%20subspecies)&fq=-occurrence_status_s:absent&fq=geospatial_kosher:true&fq=occurrence_year:*&pageSize=50&fq=occurrence_year:[*%20TO%202005-12-31T23:59:59Z]&rank=kingdom&name=Fungi
• https://biocache-ws.ala.org.au/ws/breakdown?q=cl10925%3A%22NORTHERN+TERRITORY%22&fq=rank:(species%20OR%20subspecies)&fq=-occurrence_status_s:absent&fq=geospatial_kosher:true&fq=occurrence_year:*&pageSize=50&fq=&rank=kingdom&name=Bacteri

More details

• There is nothing in the logs.
• The /breakdown response is empty with status 200.
• There are definitely records for these requests.
• A biocache-service restart fixes it.
• This causes a problem for regions.ala charts.

I would start by looking at any possible caching or thread safety problem.