diff --git a/article/search_indexes.py b/article/search_indexes.py
index d957c01f..f0d0f3b9 100644
--- a/article/search_indexes.py
+++ b/article/search_indexes.py
@@ -355,14 +355,14 @@ def prepare_communities(self, obj):
         """The ISSN is on SciELO Journal models.SciELOJournal.objects.filter(journal=j)[0].issn_scielo"""
         # set com os issns
         if obj.journal:
-            return [
-                j.issn_scielo for j in SciELOJournal.objects.filter(journal=obj.journal)
-            ]
+            return set([
+                "com_%s" % j.issn_scielo for j in SciELOJournal.objects.filter(journal=obj.journal)
+            ])
 
     def prepare_titles(self, obj):
         """The list of titles."""
         if obj.titles:
-            return [title.plain_text for title in obj.titles.all()]
+            return set([title.plain_text for title in obj.titles.all()])
 
     def prepare_creator(self, obj):
         """The list of authors is the researchers on the models that related with
@@ -373,24 +373,24 @@ class PersonName, so we used ``select_related`` to ensure that
             researchers = obj.researchers.select_related("person_name").filter(
                 person_name__isnull=False
             )
-            return [str(researcher.person_name) for researcher in researchers]
+            return set([str(researcher.person_name) for researcher in researchers])
 
     def prepare_collab(self, obj):
         """This is the instituional author."""
         if obj.collab:
-            return [collab.collab for collab in obj.collab.all()]
+            return set([collab.collab for collab in obj.collab.all()])
 
     def prepare_kw(self, obj):
         """The keywords of the article."""
         if obj.keywords:
-            return [keyword.text for keyword in obj.keywords.all()]
+            return set([keyword.text for keyword in obj.keywords.all()])
 
     def prepare_description(self, obj):
         """The abstracts of the articles
         This is a property that filter by article ``DocumentAbstract.objects.filter(article=self)``
         """
         if obj.abstracts:
-            return [abs.plain_text for abs in obj.abstracts.all()]
+            return set([abs.plain_text for abs in obj.abstracts.all()])
 
     def prepare_dates(self, obj):
         """This the publication date, that is format by YYYY-MM-DD
@@ -409,7 +409,7 @@ def prepare_dates(self, obj):
     def prepare_la(self, obj):
         """The language of the article."""
         if obj.languages:
-            return [language.code2 for language in obj.languages.all()]
+            return set([language.code2 for language in obj.languages.all()])
 
     def prepare_identifier(self, obj):
         """Add the all identifier to the article:
@@ -419,13 +419,13 @@ def prepare_identifier(self, obj):
         URL old format:
             Example: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-311X2019000104001&lang=pt
         """
-        idents = []
+        idents = set()
 
         if obj.journal:
             collections = obj.collections
             for collection in collections:
                 for lang in obj.languages.all():
-                    idents.append(
+                    idents.add(
                         "http://%s/scielo.php?script=sci_arttext&pid=%s&tlng=%s"
                         % (
                             collection.domain,
@@ -435,13 +435,13 @@ def prepare_identifier(self, obj):
                     )
 
         if obj.doi:
-            idents.extend([doi.value for doi in obj.doi.all()])
+            idents.update([doi.value for doi in obj.doi.all()])
 
         if obj.pid_v2:
-            idents.append(obj.pid_v2)
+            idents.add(obj.pid_v2)
 
         if obj.pid_v3:
-            idents.append(obj.pid_v3)
+            idents.add(obj.pid_v3)
 
         return idents
 
diff --git a/article/templates/search/indexes/article/article_compile.txt b/article/templates/search/indexes/article/article_compile.txt
index 4cccefa2..3a2fa0cb 100644
--- a/article/templates/search/indexes/article/article_compile.txt
+++ b/article/templates/search/indexes/article/article_compile.txt
@@ -16,7 +16,11 @@
         <element name="creator">
             <element name="none">
             {% for research in object.researchers.all %}
-                <field name="value">{{research.person_name}}</field>
+                {% if research.orcid %}
+                    <field name="value" orcid="{{research.orcid}}">{{research.person_name}}</field>
+                {% else %}
+                    <field name="value">{{research.person_name}}</field>
+                {% endif %}
             {% endfor %}
             </element>
         </element>
@@ -47,9 +51,20 @@
       </element>
       <element name="identifier">
          <element name="none">
+
             {% for doi in object.doi.all %}
                 <field name="value">{{ doi.value }}</field>
             {% endfor %}
+
+                <field name="value">{{ object.pid_v2 }}</field>
+                <field name="value">{{ object.pid_v3 }}</field>
+
+            {% for collection in object.collections %}
+                {% for lang in object.languages.all %}
+                    <field name="value">http://{{collection.domain}}/scielo.php?script=sci_arttext&amp;pid={{object.pid_v2}}&amp;tlng={{lang.code2}}</field>
+                {% endfor %}
+            {% endfor %}
+                    
          </element>
       </element>
       <element name="language">
@@ -74,7 +89,7 @@
     <element name="bundles"/>
     <element name="others">
         <field name="handle"/>
-        <field name="identifier">{{ object.id }}</field>
+        <field name="identifier">{{ object.pid_v2 }}</field>
         <field name="lastModifyDate">{{ object.updated|date:"c" }}</field>
     </element>
     <element name="repository">