first import

templates/block--tripal-elasticsearch--main_search_box.tpl.php

+<?php
+
+/**
+ * @file
+ * Default theme implementation to display a block.
+ *
+ * Available variables:
+ * - $block->subject: Block title.
+ * - $content: Block content.
+ * - $block->module: Module that generated the block.
+ * - $block->delta: An ID for the block, unique within each module.
+ * - $block->region: The block region embedding the current block.
+ * - $classes: String of classes that can be used to style contextually through
+ *   CSS. It can be manipulated through the variable $classes_array from
+ *   preprocess functions. The default values can be one or more of the
+ *   following:
+ *   - block: The current template type, i.e., "theming hook".
+ *   - block-[module]: The module generating the block. For example, the user
+ *     module is responsible for handling the default user navigation block. In
+ *     that case the class would be 'block-user'.
+ * - $title_prefix (array): An array containing additional output populated by
+ *   modules, intended to be displayed in front of the main title tag that
+ *   appears in the template.
+ * - $title_suffix (array): An array containing additional output populated by
+ *   modules, intended to be displayed after the main title tag that appears in
+ *   the template.
+ *
+ * Helper variables:
+ * - $classes_array: Array of html class attribute values. It is flattened
+ *   into a string within the variable $classes.
+ * - $block_zebra: Outputs 'odd' and 'even' dependent on each block region.
+ * - $zebra: Same output as $block_zebra but independent of any block region.
+ * - $block_id: Counter dependent on each block region.
+ * - $id: Same output as $block_id but independent of any block region.
+ * - $is_front: Flags true when presented in the front page.
+ * - $logged_in: Flags true when the current user is a logged-in member.
+ * - $is_admin: Flags true when the current user is an administrator.
+ * - $block_html_id: A valid HTML ID and guaranteed unique.
+ *
+ * @see template_preprocess()
+ * @see template_preprocess_block()
+ * @see template_process()
+ *
+ * @ingroup themeable
+ */
+?>
+<?php print $content ?>

templates/form/main_search_box_form.tpl.php

+<fieldset id="edit-search" class="container-inline form-wrapper">
+    <label>
+        <span class="screen-reader-text">Search for:</span>
+        <input class="search-field" placeholder="Search …" name="search_box" type="search">
+    </label>
+    <input class="search-submit" value="Search" name="op" type="submit">
+    <?php
+    hide($form['search']['search_submit']);
+    hide($form['search']['search_box']);
+    hide($form['search']);
+
+    print drupal_render_children($form);
+    ?>
+</fieldset>