Update version documentation.

Original Pull Request #2195
Closes #2194

(cherry picked from commit f917fb7)

Author: sothawo

src/main/asciidoc/preface.adoc

@@ -29,15 +29,18 @@ Requires an installation of https://www.elastic.co/products/elasticsearch[Elasti
 [[preface.versions]]
 === Versions
 
-The following table shows the Elasticsearch versions that are used by Spring Data release trains and version of Spring Data Elasticsearch included in that, as well as the Spring Boot versions referring to that particular Spring Data release train:
+The following table shows the Elasticsearch versions that are used by Spring Data release trains and version of 
+Spring Data Elasticsearch included in that, as well as the Spring Boot versions referring to that particular Spring 
+Data release train. The Elasticsearch version given shows with which client libraries Spring Data Elasticsearch was 
+built and tested.
 
 [cols="^,^,^,^,^",options="header"]
 |===
 | Spring Data Release Train | Spring Data Elasticsearch | Elasticsearch | Spring Framework | Spring Boot
-| 2022.0 (Raj) | 4.4.x | 7.17.3 | 5.3.x | 2.7.x
+| 2021.2 (Raj) | 4.4.x | 7.17.3 | 5.3.x | 2.7.x
 | 2021.1 (Q) | 4.3.x | 7.15.2 | 5.3.x | 2.6.x
-| 2021.0 (Pascal) | 4.2.x | 7.12.0 | 5.3.x | 2.5.x
-| 2020.0 (Ockham)footnote:oom[Out of maintenance] | 4.1.xfootnote:oom[] | 7.9.3 | 5.3.2 | 2.4.x
+| 2021.0 (Pascal) | 4.2.xfootnote:oom[Out of maintenance] | 7.12.0 | 5.3.x | 2.5.x
+| 2020.0 (Ockham)footnote:oom[] | 4.1.xfootnote:oom[] | 7.9.3 | 5.3.2 | 2.4.x
 | Neumannfootnote:oom[] | 4.0.xfootnote:oom[] | 7.6.2 | 5.2.12 |2.3.x
 | Moorefootnote:oom[] | 3.2.xfootnote:oom[] |6.8.12 | 5.2.12| 2.2.x
 | Lovelacefootnote:oom[] | 3.1.xfootnote:oom[] | 6.2.2 | 5.1.19 |2.1.x