From 8e0cafdd6180dac19a02dd30d0d3c0e085b8dbe9 Mon Sep 17 00:00:00 2001
From: Alex Chan <a.chan@wellcome.ac.uk>
Date: Tue, 20 Oct 2020 14:28:44 +0100
Subject: [PATCH] The ElasticIndexer should never be asked to index an empty
 list

---
 .../scala/uk/ac/wellcome/pipeline_storage/ElasticIndexer.scala   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/common/pipeline_storage/src/main/scala/uk/ac/wellcome/pipeline_storage/ElasticIndexer.scala b/common/pipeline_storage/src/main/scala/uk/ac/wellcome/pipeline_storage/ElasticIndexer.scala
index f6e5d46fee..60aec4d6e6 100644
--- a/common/pipeline_storage/src/main/scala/uk/ac/wellcome/pipeline_storage/ElasticIndexer.scala
+++ b/common/pipeline_storage/src/main/scala/uk/ac/wellcome/pipeline_storage/ElasticIndexer.scala
@@ -22,6 +22,7 @@ class ElasticIndexer[T: Indexable](
     new ElasticsearchIndexCreator(client, index, config).create
 
   final def index(documents: Seq[T]): Future[Either[Seq[T], Seq[T]]] = {
+    assert(documents.nonEmpty, "Cannot index an empty list of documents")
 
     debug(s"Indexing ${documents.map(doc => indexable.id(doc)).mkString(", ")}")