update the index
** xref:kotlin.adoc[Kotlin]
** xref:mapping.adoc[Mapping]
** xref:indexing.adoc[Indexing]
+** xref:sharding.adoc[Sharding]
** xref:queries.adoc[Querying]
** xref:querying-old.adoc[Querying (Legacy)]
** xref:updates.adoc[Updating]
