dovecot - Nov 2020 - Fatal: write(indexer) failed: Resource temporarily unavailable

Hello

I have this issue for Xapian plugin:

https://github.com/grosjo/fts-xapian/issues/62

But I am not sure where can it comes from.

Is dovecot calling some specific function in the plugin after the init, 
that would create such error ?

In doveadm dealing differently with plugins that dovecot core does ?

Has there been some recent changes in the plugin framework that would 
lead to such error ?

Thank you
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