Provides Functions to allow fix azure index bug with index rebuild

fix-azure-index-name-functions.cs

protected void SwitchPrimaryIndex(string indexName, string machineName, bool isCd)
{
  //get key
  var indexKey = GetIndexKey(indexName, machineName, isCd);

  //get current primary key name
  var currentPrimaryIndexName = database.Properties[indexKey];

  //default to this as new index name
  var newPrimaryIndexName = currentPrimaryIndexName;

  //get the new index name by adding/removing 'secondary'
  newPrimaryIndexName = ToggleIndexName(currentPrimaryIndexName, newPrimaryIndexName);

  //update the index name to the new one
  Database.Properties[indexKey] = newPrimaryIndexName;
}

protected string GetIndexKey(string indexName, string machineName, bool isCd)
{
  var iisSiteName = System.Web.Hosting.HostingEnvironment.ApplicationHost.GetSiteName();
  if (isCd)
  {
  iisSiteName = iisSiteName.ToLower().Replace("master", "");
  }
  return string.Format("{0}_{1}-{2}_CLOUD_SEARCH_PRIMARY_INDEX_NAME", indexName, machineName, iisSiteName).ToUpper();
}

protected string ToggleIndexName(string currentPrimaryIndexName, string newDdbPrimaryIndexName)
{
  if (currentPrimaryIndexName.ToLower().Contains("secondary"))
  {
  newDdbPrimaryIndexName = newDdbPrimaryIndexName.ToLower().Replace("-secondary", "");
  }
  else
  {
  newDdbPrimaryIndexName = string.Format("{0}-secondary", newDdbPrimaryIndexName);
  }
  return newDdbPrimaryIndexName;
}