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Excluding items selectively from Sitecore's Lucene search index - works when rebuilding with IndexViewer, but not when using Sitecore's built-in tools
<search>
  <configuration type="Sitecore.Search.SearchConfiguration, Sitecore.Kernel" singleInstance="true">
    <indexes hint="list:AddIndex">
      <index id="website" singleInstance="true" type="Sitecore.Search.Index, Sitecore.Kernel">
        ...

        <locations hint="list:AddCrawler">
          <master type="MyProject.Lib.Search.Indexing.CustomCrawler, MyProject">
            ...
          </master>

          <!-- Similar entry for web database. -->
        </locations>
      </index>
    </indexes>
  </configuration>
</search>

using Lucene.Net.Documents;
using Sitecore.Search.Crawlers;
using Sitecore.Data.Items;

namespace MyProject.Lib.Search.Indexing
{
  public class CustomCrawler : DatabaseCrawler
  {
    /// <summary>
    ///   Determines if the item should be included in the index.
    /// </summary>
    /// <param name="item"></param>
    /// <returns></returns>
    protected override bool IsMatch(Item item)
    {
      if (item["include in search results"] != "1")
      {
        return false;
      }

      return base.IsMatch(item);
    }
  }
}

for (int i = 0; i < database.Indexes.Count; i++)
{
  database.Indexes[i].Rebuild(database);
  ...
}

<indexes>
  <index id="website" ... type="MyProject.Lib.Search.Indexing.CustomIndex, MyProject">
    ...
  </index>

  ...
</indexes>

using Sitecore.Data;
using Sitecore.Data.Indexing;
using Sitecore.Diagnostics;

namespace MyProject.Lib.Search.Indexing
{
  public class CustomIndex : Index
  {
    public CustomIndex(string name)
      : base(name)
    {
    }

    public override void Rebuild(Database database)
    {
      Sitecore.Search.Index index = Sitecore.Search.SearchManager.GetIndex(Name);
      if (index != null)
      {
        index.Rebuild();
      }
    }
  }
}

using Sitecore.Data.Items;
using Sitecore.Search;
using Sitecore.Search.Crawlers;

namespace MyProject.Lib.Search.Indexing
{
  public class CustomCrawler : DatabaseCrawler
  {
    protected override void AddItem(Item item, IndexUpdateContext context)
    {
      if (item["include in search results"] == "1")
      {
        base.AddItem(item, context);
      }
    }
  }
}