diff --git a/docs/painless/painless-contexts/painless-reindex-context.asciidoc b/docs/painless/painless-contexts/painless-reindex-context.asciidoc
index 13b216bac6345..9aae1ae70c5ac 100644
--- a/docs/painless/painless-contexts/painless-reindex-context.asciidoc
+++ b/docs/painless/painless-contexts/painless-reindex-context.asciidoc
@@ -19,7 +19,7 @@ reindexed into a target index.
 {ref}/mapping-index-field.html[`ctx['_index']`] (`String`)::
         The name of the index.
 
-{ref}/mapping-id-field.html[`ctx['_id']`] (`int`, read-only)::
+{ref}/mapping-id-field.html[`ctx['_id']`] (`String`)::
         The unique document id.
 
 `ctx['_version']` (`int`)::
diff --git a/docs/painless/painless-contexts/painless-update-by-query-context.asciidoc b/docs/painless/painless-contexts/painless-update-by-query-context.asciidoc
index d8f9d4d7bae70..78a8b8d36d6bb 100644
--- a/docs/painless/painless-contexts/painless-update-by-query-context.asciidoc
+++ b/docs/painless/painless-contexts/painless-update-by-query-context.asciidoc
@@ -20,7 +20,7 @@ result of query.
 {ref}/mapping-index-field.html[`ctx['_index']`] (`String`, read-only)::
         The name of the index.
 
-{ref}/mapping-id-field.html[`ctx['_id']`] (`int`, read-only)::
+{ref}/mapping-id-field.html[`ctx['_id']`] (`String`, read-only)::
         The unique document id.
 
 `ctx['_version']` (`int`, read-only)::
diff --git a/docs/painless/painless-contexts/painless-update-context.asciidoc b/docs/painless/painless-contexts/painless-update-context.asciidoc
index f9ae3434827d9..53b1008cfebff 100644
--- a/docs/painless/painless-contexts/painless-update-context.asciidoc
+++ b/docs/painless/painless-contexts/painless-update-context.asciidoc
@@ -18,7 +18,7 @@ add, modify, or delete fields within a single document.
 {ref}/mapping-index-field.html[`ctx['_index']`] (`String`, read-only)::
         The name of the index.
 
-{ref}/mapping-id-field.html[`ctx['_id']`] (`int`, read-only)::
+{ref}/mapping-id-field.html[`ctx['_id']`] (`String`, read-only)::
         The unique document id.
 
 `ctx['_version']` (`int`, read-only)::