Indices and Foreign Tables

Hi,
I have a question regarding the use of indices when querying foreign data tables (using postgres_fdw of 9.3 to another
postgresDB). 
Everything works fine beside the fact that the indices which are defined in the foreign DB are not used at all when I
doquery it through the foreign data wrapper. This leads to an extremely slow query performance.  

Here is what I did:

CREATE EXTENSION postgres_fdw;

CREATE SERVER app_db
  FOREIGN DATA WRAPPER postgres_fdw
  OPTIONS (dbname ‘<DBNAME>', host 'localhost');

CREATE USER MAPPING for openbis
  SERVER app_db
  OPTIONS (user ‘<USRE>', password ‘<PW>');

CREATE FOREIGN TABLE data_sets_fdw
  (
    id bigint,
    code code,
    location file_path
  )
  SERVER app_db OPTIONS (table_name 'data_sets’);

The data_sets_fdw corresponds to the table in the other DB which is defined as this:

db=> \d data_sets
                           Table "public.data_sets"
  Column  |   Type    |                       Modifiers
----------+-----------+--------------------------------------------------------
 id       | bigint    | not null default nextval('data_sets_id_seq'::regclass)
 code     | code      | not null
 location | file_path | not null
Indexes:
    "data_sets_pkey" PRIMARY KEY, btree (id)
    "data_sets_code_key" UNIQUE CONSTRAINT, btree (code)
    "data_sets_code_idx" btree (code)

When I  realised that the queries are so slow I ran an EXPLAIN ANALYZE which shows that the indices are not used. I can
alsopost the query plan if it helps. 

So am I doing something wrong here, or is this not possible that the indices are used by the fdw?
Any hints are appreciated.
Cheers
Manuel

--
Kohler Manuel (ID SIS)
Research Informatics, Scientific IT Services (ID ETHZ)
Quantitative Genomics Facility (QGF), D-BSSE
ETH Zurich, Mattenstr. 26 (1078 1.02), CH-4058 Basel, +41 61 387 3132