PUT /test
{
  "settings" : {
    "index" : {
      "number_of_shards" : 1,
      "number_of_replicas" : 0
    }
  },
  "mappings" : {
    "object" : {
      "properties" : {
        "document_part" : {
          "type" : "nested",
          "properties": {
            "text": {
              "type": "text",
              "term_vector": "with_positions_offsets"
            }
          }

        }

      }
    }
  }
}

POST /test/object/1
{
  "document_part": {
    "text": "Here is some text to be analyzed and later queried on.  Let us use everyones favourite... The cat sat on the mat near the dog.  The cat saw the dog."
  }
}

GET /test/object/_search
{
  "_source": false,
  "query": {
    "nested": {
      "path": "document_part",
      "query": {
        "span_near": {
          "clauses": [
            {
              "span_term": { "document_part.text": "cat" }
            },
            {
              "span_term": { "document_part.text": "dog" }
            }
          ],
          "slop": 5,
          "in_order": false
        }
      },
      "inner_hits": {
        "_source": false,
        "highlight": {
          "fields": {"document_part.text": {}}
        }
      }
    }
  }
}