first import 7.x-1.4

includes/processor_ignore_case.inc

@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Processor for making searches case-insensitive.
+ */
+class SearchApiIgnoreCase extends SearchApiAbstractProcessor {
+
+  protected function process(&$value) {
+    $value = drupal_strtolower($value);
+  }
+
+}