Update high-level.asciidoc

Update document references

Author: codebrain

docs/high-level.asciidoc

@@ -166,9 +166,9 @@ NEST exposes a number of important features for indexing documents into Elastics
 
 include::{output-dir}/indexing/indexing.asciidoc[]
 
-include::{output-dir}/indexing/ingest-node.asciidoc[]
+include::{output-dir}/indexing/ingest-nodes.asciidoc[]
 
-include::{output-dir}/indexing/ingest-pipelines.asciidoc[]
+include::{output-dir}/indexing/pipelines.asciidoc[]
 
 [[analysis]]
 == Analysis