Bring back search highlight

This reverts #6087

Closes #6305

Author: stsewd

readthedocs/core/static-src/core/js/doc-embed/search.js

@@ -83,7 +83,7 @@ function attach_elastic_search_query(data) {
                         if ('BUILDER' in DOCUMENTATION_OPTIONS && DOCUMENTATION_OPTIONS.BUILDER === 'readthedocsdirhtml') {
                           suffix = '';
                         }
-                        var link = doc.link + suffix;
+                        var link = doc.link + suffix + "?highlight=" + $.urlencode(query);
 
                         var item = $('<a>', {'href': link});
 

readthedocs/core/static/core/js/readthedocs-doc-embed.js

@@ -180,14 +180,14 @@ <h3>
 
                   {% elif 'page' in result.meta.index %}
                     {% with "100" as MAX_SUBSTRING_LIMIT %}
-                      <a href="{% doc_url result.project|get_project result.version result.full_path %}">
+                      <a href="{% doc_url result.project|get_project result.version result.full_path %}?highlight={{ query }}">
                         {{ result.project }} - {% if result.meta.highlight.title %} {{ result.meta.highlight.title.0|safe }} {% else %} {{ result.title }} {% endif %}
                       </a>
 
                       {% for inner_hit in result.meta.inner_hits %}
                         {% if inner_hit.type == 'domains' %}
                           <p>
-                            <a href="{% doc_url result.project|get_project result.version result.full_path %}#{{ inner_hit.source.anchor }}">
+                            <a href="{% doc_url result.project|get_project result.version result.full_path %}?highlight={{ query }}#{{ inner_hit.source.anchor }}">
                               {% if inner_hit.highlight|get_key_or_none:"domains.name" %}
                                 {% with domain_name=inner_hit.highlight|get_key_or_none:"domains.name" %}
                                   [{{ inner_hit.source.role_name }}]: {{ domain_name.0|safe }}
@@ -211,7 +211,7 @@ <h3>
 
                         {% elif inner_hit.type == 'sections' %}
                           <p>
-                            <a href="{% doc_url result.project|get_project result.version result.full_path %}#{{ inner_hit.source.id }}">
+                            <a href="{% doc_url result.project|get_project result.version result.full_path %}?highlight={{ query }}#{{ inner_hit.source.id }}">
                               {% if inner_hit.highlight|get_key_or_none:"sections.title" %}
                                 {% with section_title=inner_hit.highlight|get_key_or_none:"sections.title" %}
                                   {{ section_title.0|safe }}