diff --git a/conf.yaml b/conf.yaml
index a39874eaf2058..47b76c4d4869f 100644
--- a/conf.yaml
+++ b/conf.yaml
@@ -172,7 +172,7 @@ contents:
             current:    1.6
             branches:   [ master, 1.x, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0 ]
             index:      docs/index.asciidoc
-            chunk:      1
+            chunk:      2
             tags:       Elastic Common Schema (ECS)/Reference
             subject:    Elastic Common Schema (ECS)
             sources:
diff --git a/doc_build_aliases.sh b/doc_build_aliases.sh
index 0aa7e188d2ad8..62c8bfc0577db 100644
--- a/doc_build_aliases.sh
+++ b/doc_build_aliases.sh
@@ -185,7 +185,7 @@ alias docbldela='$GIT_HOME/docs/build_docs --doc $GIT_HOME/elasticsearch-eland-d
 alias docbldx='$GIT_HOME/docs/build_docs --doc $GIT_HOME/x-pack/docs/en/index.asciidoc --resource=$GIT_HOME/kibana-extra/x-pack-kibana/docs --resource=$GIT_HOME/elasticsearch-extra/x-pack-elasticsearch/docs --chunk 1'
 
 # ECS
-alias docbldecs='$GIT_HOME/docs/build_docs --doc $GIT_HOME/ecs/docs/index.asciidoc --chunk 1'
+alias docbldecs='$GIT_HOME/docs/build_docs --doc $GIT_HOME/ecs/docs/index.asciidoc --chunk 2'
 
 # GKE
 alias docbldgke='$GIT_HOME/docs/build_docs --doc $GIT_HOME/stack-docs/docs/en/gke-on-prem/index.asciidoc --chunk 1'