I have 3 indexers: content from Umbraco contents, other two from external source (I use some repositories and services)

I created component for search in order to register creators and indexer

public sealed class SearchComponent : IComponent
{
  private readonly IExamineManager mExamineManager;
  private readonly SystemsIndexCreator mSystemsIndexCreator;
  private readonly ApiDocumentationIndexCreator mApiDocumentationIndexCreator;

  public SearchComponent(IExamineManager examineManager, SystemsIndexCreator SystemsIndexCreator, ApiDocumentationIndexCreator apiDocumentationIndexCreator)
  {
    mExamineManager = examineManager;
    mSystemsIndexCreator = SystemsIndexCreator;
    mApiDocumentationIndexCreator = apiDocumentationIndexCreator;
  }

  public void Initialize()
  {
    foreach (var index in mSystemsIndexCreator.Create())
      mExamineManager.AddIndex(index);

    foreach (var index in mApiDocumentationIndexCreator.Create())
      mExamineManager.AddIndex(index);
  }

The items are populated correctly, as I see data in TEMP\ExamineManager... locations

for example for api documentation set builder class I do:

public class ApiDocumentationValuesSetBuilder : IValueSetBuilder<SiteMapItem>
{
  public IEnumerable<ValueSet> GetValueSets(params MyData[] myDataItems)
  {
    var list = new List<ValueSet>();

    if (myDataItems != null)
    {
      foreach (var sitemap in myDataItems)
      {
        var fp = !string.IsNullOrWhiteSpace(sitemap.Path) ? HostingEnvironment.MapPath(ApiDocumentationService.cDocumentationFolder + sitemap.Path) : "";
        var indexValues = new Dictionary<string, object>
        {
          ["name"] = sitemap.Name,
          ["path"] = sitemap.Path,
          ["version"] = sitemap.Version ?? "",
          ["content"] = File.Exists(fp) ? File.ReadAllText(fp) : "",
          ["dircount"] = (sitemap.Directories?.Count ?? 0).ToString(),
        };

        list.Add(new ValueSet(Guid.NewGuid().ToString(), "apidocumentation", indexValues));
      }
    }

    return list;
  }
}

All good here.

I have a SearchEngine class:

public class SearchEngine
{
  private static readonly int cPerPage = 10;

  public SearchEngine(string term,
      string orderBy = null,
      int maxResults = 20)
  {
    Term = term;
    OrderBy = orderBy;
    MaxResults = maxResults;
  }

  public string Term { get; }
  public string OrderBy { get; }
  public int MaxResults { get; }

  public SearchResultModel SearchAll(IExamineManager examineManager, int page = 0)
  {
    var itemsFound = new List<SearchResultModel>
    {
      Search(examineManager, "ExternalIndex"),
      Search(examineManager, ApiDocumentationIndexRebuilder.cIndexerName, "apidocumentation"),
      Search(examineManager, SystemsIndexRebuilder.cIndexerName, "systems")
    };

    itemsFound.RemoveAll(c => c == null);
    var finalItems = itemsFound.Skip(page * cPerPage);
    return new SearchResultModel(finalItems.SelectMany(s => s.SearchResults), finalItems.Sum(s => s.Totalmilliseconds), Term, OrderBy ?? "score");
  }

  private SearchResultModel Search(IExamineManager examineManager, string indexerName, string category = null)
  {
    examineManager.TryGetIndex(indexerName, out IIndex index);
    if (index == null)
    {
      return new SearchResultModel(new EmptySearchResults(), 0, "", "");
    }

    var watch = new Stopwatch();
    watch.Start();

    var searcher = (BaseLuceneSearcher)index.GetSearcher();
    var criteria = searcher.CreateQuery(category, BooleanOperation.Or);

    // I put all fields (some are from Umbraco data, others for outside source)
    string searchFields = "nodeName,pageTitle,metaDescription,bodyText,name,content";
    IBooleanOperation terms = criteria.GroupedOr(searchFields.Split(','), Term);
    var result = terms.Execute(MaxResults);

    watch.Stop();

    return new SearchResultModel(result, watch.ElapsedMilliseconds, Term, OrderBy ?? "score");

  }
}

The problem is that term is not found nowhere since I had a lot of content that contains such keyword.

What I'm doing wrong here ?