diff --git a/modules/library/src/main/scala/zio/elasticsearch/ElasticRequest.scala b/modules/library/src/main/scala/zio/elasticsearch/ElasticRequest.scala
index bd8c77d5c..2ac64902c 100644
--- a/modules/library/src/main/scala/zio/elasticsearch/ElasticRequest.scala
+++ b/modules/library/src/main/scala/zio/elasticsearch/ElasticRequest.scala
@@ -16,6 +16,7 @@
 
 package zio.elasticsearch
 
+import zio.Chunk
 import zio.elasticsearch.ElasticPrimitive.ElasticPrimitiveOps
 import zio.elasticsearch.aggregation.ElasticAggregation
 import zio.elasticsearch.highlights.Highlights
@@ -570,10 +571,10 @@ object ElasticRequest {
     index: IndexName,
     query: ElasticQuery[_],
     sortBy: Set[Sort],
-    excluded: Option[List[String]],
+    excluded: Option[Chunk[String]],
     from: Option[Int],
     highlights: Option[Highlights],
-    included: Option[List[String]],
+    included: Option[Chunk[String]],
     routing: Option[Routing],
     searchAfter: Option[Json],
     size: Option[Int]
@@ -594,7 +595,7 @@ object ElasticRequest {
       )
 
     def excludes(field: String, fields: String*): SearchRequest =
-      self.copy(excluded = excluded.map(_ ++ (field +: fields)).orElse(Some(field +: fields.toList)))
+      self.copy(excluded = excluded.map(_ ++ (field +: fields)).orElse(Some(field +: Chunk.fromIterable(fields))))
 
     def from(value: Int): SearchRequest =
       self.copy(from = Some(value))
@@ -603,10 +604,10 @@ object ElasticRequest {
       self.copy(highlights = Some(value))
 
     def includes(field: String, fields: String*): SearchRequest =
-      self.copy(included = included.map(_ ++ (field +: fields)).orElse(Some(field +: fields.toList)))
+      self.copy(included = included.map(_ ++ (field +: fields)).orElse(Some(field +: Chunk.fromIterable(fields))))
 
     def includes[A](implicit schema: Schema.Record[A]): SearchRequest = {
-      val fields = getFieldNames(schema)
+      val fields = Chunk.fromIterable(getFieldNames(schema))
       self.copy(included = included.map(_ ++ fields).orElse(Some(fields)))
     }
 
@@ -664,16 +665,16 @@ object ElasticRequest {
     query: ElasticQuery[_],
     aggregation: ElasticAggregation,
     sortBy: Set[Sort],
-    excluded: Option[List[String]],
+    excluded: Option[Chunk[String]],
     from: Option[Int],
     highlights: Option[Highlights],
-    included: Option[List[String]],
+    included: Option[Chunk[String]],
     routing: Option[Routing],
     searchAfter: Option[Json],
     size: Option[Int]
   ) extends SearchAndAggregateRequest { self =>
     def excludes(field: String, fields: String*): SearchAndAggregateRequest =
-      self.copy(excluded = excluded.map(_ ++ (field +: fields)).orElse(Some(field +: fields.toList)))
+      self.copy(excluded = excluded.map(_ ++ (field +: fields)).orElse(Some(field +: Chunk.fromIterable(fields))))
 
     def from(value: Int): SearchAndAggregateRequest =
       self.copy(from = Some(value))
@@ -682,10 +683,10 @@ object ElasticRequest {
       self.copy(highlights = Some(value))
 
     def includes(field: String, fields: String*): SearchAndAggregateRequest =
-      self.copy(included = included.map(_ ++ (field +: fields)).orElse(Some(field +: fields.toList)))
+      self.copy(included = included.map(_ ++ (field +: fields)).orElse(Some(field +: Chunk.fromIterable(fields))))
 
     def includes[A](implicit schema: Schema.Record[A]): SearchAndAggregateRequest = {
-      val fields = getFieldNames(schema)
+      val fields = Chunk.fromIterable(getFieldNames(schema))
       self.copy(included = included.map(_ ++ fields).orElse(Some(fields)))
     }