diff --git a/app/graphql/types/query_type.rb b/app/graphql/types/query_type.rb
index 573844c..3950b8d 100644
--- a/app/graphql/types/query_type.rb
+++ b/app/graphql/types/query_type.rb
@@ -54,6 +54,8 @@ def record_id(id:, index:)
       argument :title, String, required: false, default_value: nil, description: 'Search by title'
       argument :from, String, required: false, default_value: '0',
                               description: 'Search result number to begin with (the first result is 0)'
+      argument :fulltext, Boolean, required: false, default_value: false,
+                                   description: 'Include fulltext field in search? Defaults to false.'
       argument :index, String, required: false, default_value: nil,
                                description: 'It is not recommended to provide an index value unless we have provided ' \
                                             'you with one for your specific use case'
@@ -99,11 +101,11 @@ def record_id(id:, index:)
     end
 
     def search(searchterm:, citation:, contributors:, funding_information:, geodistance:, geobox:, identifiers:,
-               locations:, subjects:, title:, index:, source:, from:, boolean_type:, **filters)
+               locations:, subjects:, title:, index:, source:, from:, boolean_type:, fulltext:, **filters)
       query = construct_query(searchterm, citation, contributors, funding_information, geodistance, geobox, identifiers,
                               locations, subjects, title, source, boolean_type, filters)
 
-      results = Opensearch.new.search(from, query, Timdex::OSClient, highlight_requested?, index)
+      results = Opensearch.new.search(from, query, Timdex::OSClient, highlight_requested?, index, fulltext)
 
       response = {}
       response[:hits] = results['hits']['total']['value']
diff --git a/app/models/opensearch.rb b/app/models/opensearch.rb
index 996def4..6aeb27f 100644
--- a/app/models/opensearch.rb
+++ b/app/models/opensearch.rb
@@ -4,14 +4,20 @@ class Opensearch
   SIZE = 20
   MAX_PAGE = 200
 
-  def search(from, params, client, highlight = false, index = nil)
+  def search(from, params, client, highlight = false, index = nil, fulltext = false)
     @params = params
     @highlight = highlight
+    @fulltext = fulltext?(fulltext)
     index = default_index unless index.present?
     client.search(index:,
                   body: build_query(from))
   end
 
+  # Only treat fulltext as true if it is boolean true or the string 'true' (case insensitive)
+  def fulltext?(fulltext_param)
+    fulltext_param == true || fulltext_param.to_s.downcase == 'true'
+  end
+
   def default_index
     ENV.fetch('OPENSEARCH_INDEX', nil)
   end
@@ -132,15 +138,23 @@ def minimum_should_match
     end
   end
 
+  # Fields to be searched in multi_match query. Adds 'fulltext' field if fulltext search is enabled.
+  def fields_to_search
+    fields = ['alternate_titles', 'call_numbers', 'citation', 'contents', 'contributors.value', 'dates.value',
+              'edition', 'funding_information.*', 'identifiers.value', 'languages', 'locations.value',
+              'notes.value', 'numbering', 'publication_information', 'subjects.value', 'summary', 'title']
+    fields << 'fulltext' if @fulltext
+
+    fields
+  end
+
   def matches
     m = []
     if @params[:q].present?
       m << {
         multi_match: {
           query: @params[:q].downcase,
-          fields: ['alternate_titles', 'call_numbers', 'citation', 'contents', 'contributors.value', 'dates.value',
-                   'edition', 'funding_information.*', 'identifiers.value', 'languages', 'locations.value',
-                   'notes.value', 'numbering', 'publication_information', 'subjects.value', 'summary', 'title'],
+          fields: fields_to_search,
           minimum_should_match:
         }
       }
diff --git a/test/models/opensearch_test.rb b/test/models/opensearch_test.rb
index f5173ef..7f4b89f 100644
--- a/test/models/opensearch_test.rb
+++ b/test/models/opensearch_test.rb
@@ -86,6 +86,21 @@ class OpensearchTest < ActiveSupport::TestCase
     end
   end
 
+  test 'fulltext is included when requested' do
+    os = Opensearch.new
+    os.instance_variable_set(:@params, { q: 'this' })
+    os.instance_variable_set(:@fulltext, true)
+
+    assert(os.matches.to_json.include?('"fields":["alternate_titles","call_numbers","citation","contents","contributors.value","dates.value","edition","funding_information.*","identifiers.value","languages","locations.value","notes.value","numbering","publication_information","subjects.value","summary","title","fulltext"]'))
+  end
+
+  test 'fulltext is not included by default' do
+    os = Opensearch.new
+    os.instance_variable_set(:@params, { q: 'this' })
+
+    assert(os.matches.to_json.include?('"fields":["alternate_titles","call_numbers","citation","contents","contributors.value","dates.value","edition","funding_information.*","identifiers.value","languages","locations.value","notes.value","numbering","publication_information","subjects.value","summary","title"]'))
+  end
+
   test 'searches a single field' do
     VCR.use_cassette('opensearch single field') do
       params = { title: 'spice it up' }