diff --git a/models/elasticsearch.go b/models/elasticsearch.go
index c97dcb40..697679fd 100644
--- a/models/elasticsearch.go
+++ b/models/elasticsearch.go
@@ -54,12 +54,12 @@ type ESSourceDocument struct {
 }
 
 type ESHighlight struct {
-	DescriptionTitle     *[]string `json:"description.title"`
-	DescriptionEdition   *[]string `json:"description.edition"`
-	DescriptionSummary   *[]string `json:"description.summary"`
-	DescriptionMeta      *[]string `json:"description.metaDescription"`
-	DescriptionKeywords  *[]string `json:"description.keywords"`
-	DescriptionDatasetID *[]string `json:"description.datasetId"`
+	DescriptionTitle     []*string `json:"description.title"`
+	DescriptionEdition   []*string `json:"description.edition"`
+	DescriptionSummary   []*string `json:"description.summary"`
+	DescriptionMeta      []*string `json:"description.metaDescription"`
+	DescriptionKeywords  []*string `json:"description.keywords"`
+	DescriptionDatasetID []*string `json:"description.datasetId"`
 }
 
 // ********************************************************
diff --git a/models/esmodels.go b/models/esmodels.go
index 38cf157b..d91043bd 100644
--- a/models/esmodels.go
+++ b/models/esmodels.go
@@ -29,7 +29,7 @@ type DescriptionLegacy struct {
 	Headline2         string              `json:"headline2,omitempty"`
 	Headline3         string              `json:"headline3,omitempty"`
 	Highlight         *HighlightObjLegacy `json:"highlight,omitempty"`
-	Keywords          *[]string           `json:"keywords,omitempty"`
+	Keywords          []*string           `json:"keywords,omitempty"`
 	LatestRelease     *bool               `json:"latest_release,omitempty"`
 	Language          string              `json:"language,omitempty"`
 	MetaDescription   string              `json:"meta_description,omitempty"`
@@ -52,7 +52,7 @@ type contactLegacy struct {
 type HighlightObjLegacy struct {
 	DatasetID       string    `json:"dataset_id,omitempty"`
 	Edition         string    `json:"edition,omitempty"`
-	Keywords        *[]string `json:"keywords,omitempty"`
+	Keywords        []*string `json:"keywords,omitempty"`
 	MetaDescription string    `json:"meta_description,omitempty"`
 	Summary         string    `json:"summary,omitempty"`
 	Title           string    `json:"title,omitempty"`
@@ -86,7 +86,7 @@ type ESSourceDocumentLegacy struct {
 		Summary           string         `json:"summary"`
 		NextRelease       string         `json:"nextRelease,omitempty"`
 		Unit              string         `json:"unit,omitempty"`
-		Keywords          *[]string      `json:"keywords,omitempty"`
+		Keywords          []*string      `json:"keywords,omitempty"`
 		ReleaseDate       string         `json:"releaseDate,omitempty"`
 		Edition           string         `json:"edition,omitempty"`
 		LatestRelease     *bool          `json:"latestRelease,omitempty"`
@@ -107,12 +107,12 @@ type ESSourceDocumentLegacy struct {
 }
 
 type ESHighlightLegacy struct {
-	DescriptionTitle     *[]string `json:"description.title"`
-	DescriptionEdition   *[]string `json:"description.edition"`
-	DescriptionSummary   *[]string `json:"description.summary"`
-	DescriptionMeta      *[]string `json:"description.metaDescription"`
-	DescriptionKeywords  *[]string `json:"description.keywords"`
-	DescriptionDatasetID *[]string `json:"description.datasetId"`
+	DescriptionTitle     []*string `json:"description.title"`
+	DescriptionEdition   []*string `json:"description.edition"`
+	DescriptionSummary   []*string `json:"description.summary"`
+	DescriptionMeta      []*string `json:"description.metaDescription"`
+	DescriptionKeywords  []*string `json:"description.keywords"`
+	DescriptionDatasetID []*string `json:"description.datasetId"`
 }
 
 type ESResponseAggregationsLegacy struct {
diff --git a/transformer/transformer.go b/transformer/transformer.go
index 184974cd..a817fd80 100644
--- a/transformer/transformer.go
+++ b/transformer/transformer.go
@@ -138,32 +138,32 @@ func (t *LegacyTransformer) buildDescription(doc models.ESResponseHitLegacy, hig
 	return des
 }
 
-func (t *LegacyTransformer) overlaySingleItem(hl *[]string, def string, highlight bool) (overlaid string) {
-	if highlight && hl != nil && len(*hl) > 0 {
-		overlaid = (*hl)[0]
+func (t *LegacyTransformer) overlaySingleItem(hl []*string, def string, highlight bool) (overlaid string) {
+	if highlight && hl != nil && len(hl) > 0 {
+		overlaid = *(hl)[0]
 	}
 	return
 }
 
-func (t *LegacyTransformer) overlayItemList(hlList, defaultList *[]string, highlight bool) *[]string {
+func (t *LegacyTransformer) overlayItemList(hlList, defaultList []*string, highlight bool) []*string {
 	if defaultList == nil || hlList == nil {
 		return nil
 	}
 
-	overlaid := make([]string, len(*defaultList))
-	copy(overlaid, *defaultList)
+	overlaid := make([]*string, len(defaultList))
+	copy(overlaid, defaultList)
 	if highlight {
-		for _, hl := range *hlList {
-			unformatted := t.higlightReplacer.Replace(hl)
+		for _, hl := range hlList {
+			unformatted := t.higlightReplacer.Replace(*hl)
 			for i, defItem := range overlaid {
-				if defItem == unformatted {
+				if *defItem == unformatted {
 					overlaid[i] = hl
 				}
 			}
 		}
 	}
 
-	return &overlaid
+	return overlaid
 }
 
 func buildContentTypes(bucket models.ESBucketLegacy) models.ContentTypeLegacy {
diff --git a/transformer/transformer_test.go b/transformer/transformer_test.go
index 04043245..d5b7e391 100644
--- a/transformer/transformer_test.go
+++ b/transformer/transformer_test.go
@@ -11,6 +11,7 @@ import (
 )
 
 func TestLegacyTransformer(t *testing.T) {
+	t.Parallel()
 	Convey("Transforms unmarshalled search responses successfully", t, func() {
 		transformer := NewLegacy()
 		Convey("Zero suggestions creates empty array", func() {
@@ -79,6 +80,7 @@ func TestLegacyTransformer(t *testing.T) {
 }
 
 func TestLegacyBuildAdditionalSuggestionsList(t *testing.T) {
+	t.Parallel()
 	Convey("buildAdditionalSuggestionList successfully", t, func() {
 		Convey("returns array of strings", func() {
 			query1 := buildAdditionalSuggestionList("test-query")
@@ -100,6 +102,7 @@ func TestLegacyBuildAdditionalSuggestionsList(t *testing.T) {
 }
 
 func TestLegacyTransformSearchResponse(t *testing.T) {
+	t.Parallel()
 	Convey("With a transformer initialised", t, func() {
 		ctx := context.Background()
 		transformer := NewLegacy()
@@ -167,6 +170,7 @@ func TestLegacyTransformSearchResponse(t *testing.T) {
 }
 
 func TestTransform(t *testing.T) {
+	t.Parallel()
 	expectedESDocument1 := models.ESSourceDocument{
 		DataType:        "anyDataType1",
 		JobID:           "",