do not use server header for capi_indexer

Change-Id: I79ead4b0905832a80f7c166e54230ec148908cf6
Reviewed-on: http://review.couchbase.org/36739
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>