Removing specific content type(s) from search results

If you do not want specific content types to be included in your search results, you will want to add the following filter statement(s) in your module.

The TRUE is set to exclude this type of content type. If you want your search results to ONLY include a specific content type you would not include the TRUE.

/**
 * Implementation of hook_apachesolr_modify_query().
 */
function mymodule_apachesolr_modify_query(&$query, &$params, $caller) {
  $query->add_filter('type', 'profile', TRUE); // Does not include profile content types in search results.
  $query->add_filter('type', 'story', TRUE); // Does not include profile content types in search results.
}

NOTE: If you do not include the TRUE to exclude a content type (or other results information) you can only have one filter per type, or hash, etc.

For Drupal 7

function MYMODULE_apachesolr_query_prepare($query) {
    $query->addFilter('bundle', 'story', $exclude = TRUE);
}