title: Nested fields indexing failing for elastic search
body: <p>i have installed the following 
  1.Elasticsearch 1.0.0  \
  2.Mongodb 2.4.9 \
  3.MongoDB River Plugin 2.0.0\
  4.Mapper-attachments \</p>
  
  <p>when  i  try to index the mongodb dataset with nested fields the following error it is raising</p>
  
  <p><strong>[2014-05-13 16:49:58,442][ERROR][org.elasticsearch.river.mongodb.MongoDBRiverBulkProcessor] Bulk processor failed. failure in bulk execution:
  [0]: index [dava], type [dava_listings], id [5260ea6cfe821b3c2fd0d9ac], message [MapperParsingException[failed to parse [business.phone_numbers]]; nested: NumberFormatException[For input string: "(303) 427-9484"]; ]
  [1]: index [dava], type [dava_listings], id [5260ea6cfe821b3c2fd0e524], message [MapperParsingException[failed to parse [business.phone_numbers]]; nested: ElasticsearchIllegalArgumentException[unknown property [0]]; ]
  [2]: index [dava], type [dava_listings], id [5260ea6cfe821b3c2fd0e5e7], message [MapperParsingException[failed to parse [business.phone_numbers]]; nested: ElasticsearchIllegalArgumentException[unknown property [0]]; ]</strong></p>