Additionally, here the errors I get in logs:

Dovecot:

Dec 09 09:21:09 imap(jom@grosjo.net)<3349><DiRnXpN8Lux/AAAB>: Error: fts_solr: received invalid uid '0'
Dec 09 09:21:10 imap(jom@grosjo.net)<3349><DiRnXpN8Lux/AAAB>: Error: fts_solr: received invalid uid '0'

11 03:36:03 indexer-worker(jom@grosjo.net)<2093><icWMJaIwD1znEgAA0thIag:GPBOCKMwD1wtCAAA0thIag>: Error: fts_solr: Indexing failed: 500 Server Error

Solr:

Caused by: org.apache.lucene.store.AlreadyClosedException: this IndexWriter is closed
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.IndexWriter.ensureOpen(IndexWriter.java:679)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.IndexWriter.ensureOpen(IndexWriter.java:693)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.IndexWriter.nrtIsCurrent(IndexWriter.java:4929)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(StandardDirectoryReader.java:290)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:279)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.DirectoryReader.openIfChanged(DirectoryReader.java:235)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:2039)
Dec 11 06:00:14 gjserver solr[16761]: ... 51 more
Dec 11 06:00:14 gjserver solr[16761]: Caused by: java.lang.ArrayIndexOutOfBoundsException: -65536
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.TermsHashPerField.writeByte(TermsHashPerField.java:198)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.TermsHashPerField.writeVInt(TermsHashPerField.java:224)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.FreqProxTermsWriterPerField.writeProx(FreqProxTermsWriterPerField.java:80)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.FreqProxTermsWriterPerField.addTerm(FreqProxTermsWriterPerField.java:184)
Dec 11 06:00:14 gjserver solr[16761]: at org.apache.lucene.index.TermsHashPerField.add(TermsHashPerField.java:185)

On 2018-12-10 21:40, Joan Moreau wrote:

Hi Daniel,

THere is no need of all this, just the command (on Solr 7.5) "create -c dovecot " is enough

The chema.xml provided on the wiki basically does not work on 7.5

Here the latest one I am working on , but nothing works properly (bad search results, errors in ftp_solr, etc..)

<?xml version="1.0" encoding="UTF-8"?>
<schema name="dovecot" version="2.0">
<uniqueKey>id</uniqueKey>
<types>
<fieldType name="string" class="solr.StrField" />
<fieldType name="long" class="solr.LongPointField" positionIncrementGap="0" />
<fieldType name="text" class="solr.TextField" autoGeneratePhraseQueries="true" positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/>
<filter class="solr.WordDelimiterGraphFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnCaseChange="1" splitOnNumerics="1" catenateWords="1" catenateNumbers="1" catenateAll="1"/>
<filter class="solr.FlattenGraphFilterFactory"/> 
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.NGramFilterFactory" minGramSize="3" maxGramSize="15" />
<filter class="solr.KeywordMarkerFilterFactory" protected="protwords.txt"/>
<filter class="solr.PorterStemFilterFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms.txt"/>
<filter class="solr.FlattenGraphFilterFactory"/> 
<filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/>
<filter class="solr.WordDelimiterGraphFilterFactory" generateWordParts="1" generateNumberParts="1" splitOnCaseChange="1" splitOnNumerics="1" catenateWords="1" catenateNumbers="1" catenateAll="1"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.NGramFilterFactory" minGramSize="3" maxGramSize="15" />
<filter class="solr.KeywordMarkerFilterFactory" protected="protwords.txt"/>
<filter class="solr.PorterStemFilterFactory"/>
</analyzer>
</fieldType>
</types>
<fields>
<field name="_version_" type="long" indexed="true" stored="true"/>
<field name="bcc" type="text" indexed="true" stored="false"/>
<field name="body" type="text" indexed="true" stored="false"/>
<field name="box" type="string" indexed="false" required="true" stored="true"/>
<field name="hdr" type="text" indexed="true" stored="false"/>
<field name="cc" type="text" indexed="true" stored="false"/>
<field name="from" type="text" indexed="true" stored="false"/>
<field name="id" type="string" indexed="true" required="true" stored="true"/>
<field name="subject" type="text" indexed="true" stored="false"/>
<field name="to" type="text" indexed="true" stored="false"/>
<field name="uid" type="long" indexed="true" required="true" stored="true"/>
<field name="user" type="string" indexed="true" required="true" stored="true"/>
</fields>
</schema>

On 2018-12-10 21:17, Daniel Miller via dovecot wrote:
On 12/4/2018 10:40 AM, Joan Moreau via dovecot wrote:

In the Wiki, ( https://wiki.dovecot.org/Plugins/FTS/Solr ), it would nice to stipulate to the reader to type the command :

sudo -u solr /opt/solr/bin/solr create -c dovecot # to create the dovecot instance

before updating the schema.xml .

Also, schema.xml is in /opt/solr/server/solr/dovecot/conf for archlinux users

Additionaly, the url is http://(solr_server):8983/solr/dovecot/ (error in wiki)

After installing Solr, wherever the installation sets up there should a folder similar to:

<your prefix>/solr/server/solr/configsets

If you look there, you'll probably see folders like '_default' and 'sample_techproducts_configs'. I haven't played with the 'techproducts' sample. Copy the '_default' folder, with all its contents, to a 'dovecot' folder. In the new dovecot folder, replace the 'managed-schema' file with the file from the Dovecot Wiki

https://wiki.dovecot.org/Plugins/FTS/Solr?action=AttachFile&do=view&target=solr-7.x-schema.xml

after that, you should be able to run 'solr /opt/solr/bin/solr create -c dovecot' to create the instance. If things still don't work let us know.

The schema is one I've tweaked and updated during my own migrations since Solr 3.3. It's possible there's something else in my config that needs documenting - but having experienced Solr search against my mailstore I never want to be without it.
Daniel