  [javadoc] Generating Javadoc
  [javadoc] Debian build on Java 9+ detected: Adding the --ignore-source-errors option
  [javadoc] Javadoc execution
  [javadoc] Loading source files for package org.apache.lucene.analysis.pl...
  [javadoc] Loading source files for package org.apache.lucene.analysis.stempel...
  [javadoc] Loading source files for package org.egothor.stemmer...
  [javadoc] Constructing Javadoc information...
  [javadoc] Standard Doclet version 11.0.1
  [javadoc] Building tree for all the packages and classes...
  [javadoc] /build/lucene-solr-mtjbrd/lucene-solr-3.6.2+dfsg/lucene/contrib/analyzers/stempel/src/java/org/egothor/stemmer/Row.java:222: warning - invalid usage of tag >
  [javadoc] Building index for all the packages and classes...
  [javadoc] Building index for all classes...
  [javadoc] Building index for all classes...
  [javadoc] Generating /build/lucene-solr-mtjbrd/lucene-solr-3.6.2+dfsg/lucene/build/docs/api/contrib-stempel/help-doc.html...
  [javadoc] Note: Custom tags that were not seen:  @lucene.internal, @lucene.experimental
  [javadoc] 1 warning
