elasticsearch polymerization or multi-field for the field of polymerization substring

 

The following fields are substring polymerization, taken 'your_field' before eight polymerized

 

        Script script = new Script("doc['your_field'].getValue().substring(0,8)");
        CardinalityAggregationBuilder pointCardinality = AggregationBuilders.cardinality("pointCardinality").script(script).precisionThreshold(400000);
        SearchResponse totalPointResponse = client.prepareSearch("index_name").setTypes("type_name")
                .setQuery(boolQueryBuilder)
                .addAggregation(pointCardinality)
                .execute()
                .actionGet();
        Cardinality cardinalityTotal = totalPointResponse.getAggregations().get("pointCardinality");

 

Multi polymerization field, is the need to modify the content Script (plainless), for example, selected according to the field conditions and the like:

eg: 

if(doc['camera_dev_name'].size() != 0){doc['camera_dev_name'].getValue().substring(0,8)}else{doc['ap_dev_name.keyword'].getValue().substring(0,8)}

 Script simply by changing the content.