[DOCS] Update rollup def (elastic#66870)

nik9000 · Dec 29, 2020 · 68a8347 · 68a8347
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diff --git a/docs/reference/glossary.asciidoc b/docs/reference/glossary.asciidoc
@@ -451,8 +451,8 @@ ifdef::permanently-unreleased-branch[]
 
 [[glossary-rollup]] rollup ::
 // tag::rollup-def[]
-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.
+Aggregates an index's time series data and stores the results in a new read-only
+index. For example, you can roll up hourly data into daily or weekly summaries.
 // end::rollup-def[]
 
 endif::[]

diff --git a/docs/reference/rollup/apis/rollup-api.asciidoc b/docs/reference/rollup/apis/rollup-api.asciidoc
@@ -6,8 +6,8 @@
 <titleabbrev>Rollup</titleabbrev>
 ++++
 
-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.
+Aggregates an index's time series data and stores the results in a new read-only
+index. For example, you can roll up hourly data into daily or weekly summaries.
 
 [source,console]
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