revised goto-strategy

engine.rb goto_result

def goto_result
    return nil unless @goto_search and autolink_match?
    options = { queries: autolink_query, sort: 'chunkno asc', rows: 100, fl: 'topid,docid,chunkno,docverstype,productkeys' }
    hits = Solr::Chunk.find(options)
    if hits.docs.empty?
      hits = Solr::Chunk.find(options, :searchable)
    end
    chunks = hits.docs.sort_by { |d| [ Document::PREFERRED_DOCVERSTYPE_ORDER.index(d[:docverstype]), d[:chunkno].to_i ] }
    uniq_documents = chunks.uniq { |c| c[:topid] }
    # only return first if its the only one of its kind
    chunks.first unless uniq_documents.select { |d| d['docverstype'] == chunks.first['docverstype'] && !(d['ophmark'] == '1' or d['histmark'] == '1' or d['histprod'] == '1') }.size > 1
  end