[DOCS] Rollup V2: Fix rollup index def (#65770)

elastic · Dec 8, 2020 · 87c803c · 87c803c
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diff --git a/docs/reference/glossary.asciidoc b/docs/reference/glossary.asciidoc
@@ -451,7 +451,7 @@ ifdef::permanently-unreleased-branch[]
 
 [[glossary-rollup]] rollup ::
 // tag::rollup-def[]
-Aggregates an index's time series data and stores the results in another index.
+Aggregates an index's time series data and stores the results in a new index.
 For example, you can roll up hourly data into daily or weekly summaries.
 // end::rollup-def[]
 

diff --git a/docs/reference/rollup/apis/rollup-api.asciidoc b/docs/reference/rollup/apis/rollup-api.asciidoc
@@ -6,7 +6,7 @@
 <titleabbrev>Rollup</titleabbrev>
 ++++
 
-Aggregates an index's time series data and stores the results in another index.
+Aggregates an index's time series data and stores the results in a new index.
 For example, you can roll up hourly data into daily or weekly summaries.
 
 [source,console]
@@ -67,12 +67,13 @@ syntax>> or wildcards (`*`).
 
 `rollup_index`::
 (Required, string)
-Index that stores the rollup results. Cannot be a <<data-streams,data stream>>
-or <<indices-aliases,index alias>>.
+New index that stores the rollup results. Cannot be an existing index,
+a <<data-streams,data stream>>, or an <<indices-aliases,index alias>>.
 +
-If this index does not exist, the request creates it. If the `<index>` is a
-backing index for a data stream, this new index is a backing index for the same
-stream.
+The request creates this index with
+<<index-modules-blocks,`index.blocks.write`>> set to `true`. If the original
+`<index>` is a backing index for a data stream, this index is a backing index
+for the same stream.
 
 `groups`::
 (Required, object)

diff --git a/docs/reference/rollup/rollup-apis.asciidoc b/docs/reference/rollup/rollup-apis.asciidoc
@@ -6,7 +6,7 @@
 ifdef::permanently-unreleased-branch[]
 
 A rollup aggregates an index's time series data and stores the results in
-another index. For example, you can roll up hourly data into daily or weekly
+a new index. For example, you can roll up hourly data into daily or weekly
 summaries.
 
 * <<rollup-api,Rollup API>>