Add solr full text search based on https://github.com/jvolkenant/mailinabox/tree/solr-jetty

conf/cron/miab_dovecot

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+#!/bin/bash
+/usr/bin/doveadm fts rescan -A > /dev/null 2>&1

conf/cron/miab_solr

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+*/1 * * * * root /usr/bin/curl -s http://127.0.0.1:8080/solr/update?commit=true >/dev/null 2>&1
+30  3 * * * root /usr/bin/curl -s http://127.0.0.1:8080/solr/update?optimize=true >/dev/null 2>&1