Update Search image to provide Clouseau 2.17.0

Previously we were using 4dbd4ba of Clouseau for no particularly good
reason. The 2.17.0 release includes a number of fixes and is required
for running with Erlang 20 and above.
diff --git a/couchdb/values.yaml b/couchdb/values.yaml
index a790e15..6a35426 100644
--- a/couchdb/values.yaml
+++ b/couchdb/values.yaml
@@ -66,7 +66,7 @@
 ## Experimental integration with Lucene-powered fulltext search
 searchImage:
   repository: kocolosk/couchdb-search
-  tag: 0.1.2
+  tag: 0.2.0
   pullPolicy: IfNotPresent
 
 ## Flip this to flag to include the Search container in each Pod