Timeout when making query while purging

I have tried to make a query during a purge of many documents from the database and I get the following timeout error:

`Error running query. Reason: (timeout) The request could not be processed in a reasonable amount of time.`

And the following couchdb log error:

`
[error] 2022-10-03T15:25:47.790110Z couchdb@127.0.0.1 <0.27022.0> aa85e646df fabric_worker_timeout map_view,'couchdb@127.0.0.1',<<"shards/00000000-7fffffff/database.1664801850">>`

It catches my attention since I am querying a partition whose documents are not included in the purge. That is, I am purging documents from partition2 and querying a view on partition1 using the `get_partitioned_view_result` method.

What is the cause of the error? Is it not possible to perform queries while documents are being purged? Is it due to couchdb configuration?

Start by reproducing a query with get_partitioned_view_result on partition1 while purging many documents from partition2, then review the reported fabric_worker_timeout log entry. Check the CouchDB configuration and query/purge behavior to determine the cause and whether concurrent queries are supported; done means documenting the explanation and any relevant configuration or limitation.

Written by the indexing model from the issue text.