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

conf/solr-jetty.xml

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+<?xml version="1.0"  encoding="ISO-8859-1"?>
+<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">
+
+<!-- Context configuration file for the Solr web application in Jetty -->
+
+<Configure class="org.eclipse.jetty.webapp.WebAppContext">
+  <Set name="contextPath">/solr</Set>
+  <Set name="war">/usr/share/solr/web</Set>
+
+  <!-- Set the solr.solr.home system property -->
+  <Call name="setProperty" class="java.lang.System">
+    <Arg type="String">solr.solr.home</Arg>
+    <Arg type="String">/usr/share/solr</Arg>
+  </Call>
+
+  <!-- Enable symlinks -->
+  <!--  <Call name="addAliasCheck">
+    <Arg>
+      <New class="org.eclipse.jetty.server.handler.ContextHandler$ApproveSameSuffixAliases"/>
+    </Arg>
+  </Call>-->
+</Configure>