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public class LogExtractor : IFieldExtractor
{
    private readonly string[] extensions = new string[] { ".log" };
 
    public string[] Extensions
    {
        get { return extensions; }
    }
 
    public DocumentField[] GetFields(string filePath)
    {
        FileInfo fileInfo = new FileInfo(filePath);
        DocumentField[] fields = new DocumentField[]
        {
            new DocumentField("FileName", fileInfo.FullName),
            new DocumentField("CreationDate", fileInfo.CreationTime.ToString(CultureInfo.InvariantCulture)),
            new DocumentField("Content", ExtractContent(filePath)),
        };
        return fields;
    }
 
    private string ExtractContent(string filePath)
    {
        string text = File.ReadAllText(filePath);
        return text;
    }
}

string indexFolder = @"c:\MyIndex\"; // Specify path to the index folder
string documentsFolder = @"c:\MyDocuments\"; // Specify path to a folder containing documents to search
 
IndexSettings settings = new IndexSettings();
settings.CustomExtractors.Add(new LogExtractor()); // Adding custom text extractor to the index settings
 
Index index = new Index(indexFolder, settings); // Creating or loading an index
 
index.Add(documentsFolder); // Indexing documents from the specified folder