completer is not a SuggestField

[Leonardo Pérez Pulido]

Hello everyone,

java.lang.IllegalArgumentException: completer is not a SuggestField, is the 
exception I got when I run a completion query against a suggest field.

At index-time I have a CustomAnalyzer like:

ClasspathResourceLoader resourceLoader = new
            ClasspathResourceLoader(Indexer.class);
Analyzer analyzer = CustomAnalyzer.builder(resourceLoader)
      .withTokenizer(StandardTokenizerFactory.class)
      .addTokenFilter(StandardFilterFactory.class)
      .addTokenFilter(StopFilterFactory.class,
              "ignoreCase", "true")
      .addTokenFilter(LowerCaseFilterFactory.class)
      .addTokenFilter(EnglishPossessiveFilterFactory.class)
      .addTokenFilter(ASCIIFoldingFilterFactory.class)
      .build();
CompletionAnalyzer completionAnalyzer = new CompletionAnalyzer(analyzer);

Directory directory = FSDirectory.open(Paths.get("completionIndex"));
IndexWriterConfig writerConfig = new IndexWriterConfig(completionAnalyzer);
writerConfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
IndexWriter indexWriter = new IndexWriter(directory, writerConfig);


Then I walk along a file tree to index the suggester field like:

Files.walkFileTree(Paths.get("docs"), new SimpleFileVisitor<Path>() {
  @Override
  public FileVisitResult visitFile(Path ofEachFile, BasicFileAttributes attr)
          throws IOException {

    Document doc = new Document();
    SuggestField suggestField;

    List<String> fileLines = Files.readAllLines(ofEachFile);

    List<String> contentLines = fileLines.subList(6, fileLines.size());

    StringBuilder sb = new StringBuilder();
    for(int i = 0; i < contentLines.size(); i++) {
      sb.append(contentLines.get(i));
      sb.append("\n");
    }
    String content = sb.toString();

    suggestField = new SuggestField("completer", content, 4);

    doc.removeField("completer");

    doc.add(suggestField);

    indexWriter.addDocument(doc);

    return FileVisitResult.CONTINUE;
  }
});

indexWriter.close();

}


At search time, I got the same CustomAnalyzer as above and then:

// CustomAnalyzer...

Directory indexDirectory = FSDirectory.open(Paths.get("completionIndex"));
IndexReader indexReader = DirectoryReader.open(indexDirectory);
// IndexSearcher indexSearcher = new IndexSearcher(indexReader);
SuggestIndexSearcher suggestSearcher = new SuggestIndexSearcher(indexReader);

//Term term = new Term("completer", "blatavts");
CompletionQuery query = new PrefixCompletionQuery(completionAnalyzer,
  new Term("completer", "blavats"));
TopSuggestDocs suggestDocs = sis.suggest(query, 4, false);

int docID;
Document doc;
for(ScoreDoc sd : suggestDocs.scoreDocs) {
  docID = sd.doc;
  doc = sis.doc(docID);
  System.out.println(sd);
}

And got the exception.