Merge pull request #1427 from influxdata/fix-flux-links

Fix broken link and add redirect

content/influxdb/v1.8/flux/guides/_index.md

@@ -2,6 +2,9 @@
 title: Query data with Flux
 description: Guides that walk through both common and complex queries and use cases for Flux.
 weight: 3
+aliases:
+    - /flux/latest/
+    - /flux/latest/introduction
 menu:
   influxdb_1_8:
     name: Query with Flux

content/influxdb/v1.8/tools/api.md

@@ -47,7 +47,7 @@ The following forward compatible APIs are available:
 ### `/api/v2/query/` HTTP endpoint
 
 The `/api/v2/query` endpoint accepts `POST` HTTP requests.
-Use this endpoint to query data using [Flux](/flux/latest/) and [InfluxDB 2.0 client libraries](/influxdb/v2.0/reference/api/client-libraries/).
+Use this endpoint to query data using [Flux](/influxdb/v1.8/flux/) and [InfluxDB 2.0 client libraries](/influxdb/v2.0/reference/api/client-libraries/).
  Flux is the primary language for working with data in InfluxDB 2.0.
 
 **Include the following HTTP headers:**