[DOCS] Rename ES Reference to ES Guide (#71198)

jrodewig · jrodewig · commit 361cbab388eb · 2021-04-01T15:45:19.000-04:00
diff --git a/docs/reference/index.asciidoc b/docs/reference/index.asciidoc
@@ -1,5 +1,5 @@
 [[elasticsearch-reference]]
-= Elasticsearch Reference
+= Elasticsearch Guide
 
 :include-xpack:         true
 :es-test-dir:           {docdir}/../src/test
