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@j_nunes The point is apache solr module considers custom field as multivalued, nevertheless the field is single valued. You can see apachesolr_get_field_mappings($entity_type) in apachesolr.module. What you can do is alter field mapping for the custom field. See the code:
/**
* Implements hook_apachesolr_field_mappings_alter().
*/
function my_module_apachesolr_field_mappings_alter(array &$mappings, $entity_type) {
// By default every custom field is considered as a multivalued solr field.
// @see apachesolr_get_field_mappings($entity_type)
// We check here whether `field_date` is set to multivalued or not, and
// according to that we change the cardinality of solr field.
$field_date = field_info_field('field_date');
if (!empty($field_date) && $field_date['cardinality'] == 1) {
$mappings['per-field']['field_date'] = $mappings['date'];
$mappings['per-field']['field_date']['multiple'] = FALSE;
}
}
This way you can alter the cardinality of a solr field.
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