I'm trying to add some custom fields(image field, text field) in Apache Solr's search result.
I ended up found the code below; however, I don't know:

1. Where to put this code (is it template.php?)
2. How to get the information to display them.

`

```
function mymodule_apachesolr_update_index($document, $node, $namespace) {
  // When indexing nodes, add field from my custom content type.
  if ($node->type === 'my_contenttype') {
    // Grab the image URI and the description.
    $image_uri = $node->field_image['und'][0]['uri'];
    $description = $node->field_description['und'][0]['safe_value'];
    // Add the image and description to the document in the solr index.
    $document->addField('ss_my_contenttype_image', $image_uri);
    $document->addField('ts_my_contenttype_description', $description);
  }
}

function mymodule_apachesolr_query_prepare($query) {
  // Add the image.
  $query->addParam('fl', 'ss_my_contenttype_image');
  // Add the description text.
  $query->addParam('fl', 'ts_my_contenttype_description');
}

```

I appreciate any advice.
Thank you.