使用Java API进行Elasticsearch排序

Question

I am trying to sort my document based on totalEmployee field, where index is index_db , the type is departments and a field is totalEmployee

QueryBuilder qb = QueryBuilders.matchAllQuery();
            SearchResponse response = client.prepareSearch("index_db").setTypes("departments")
                    .addSort(SortBuilders.fieldSort("totalEmployee").order(SortOrder.ASC)).setQuery(qb)
                    .setSize(100).execute().actionGet();
            for(SearchHit hits :response.getHits()) {
                System.out.print("id = "+hits.getId());
                System.out.println(hits.getSourceAsString());
            }

But I am getting error :

Exception in thread "main" Failed to execute phase [query], all shards failed; shardFailures {[q9B7Qs-DSXWC14pjc5zlNg][index_db][0]: RemoteTransportException[[elasticsearch_node][10.64.216.92:9375][indices:data/read/search[phase/query]]]; nested:

IllegalArgumentException[Fielddata is disabled on text fields by default. Set fielddata=true on [totalEmployee] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.]; }{[q9B7Qs-DSXWC14pjc5zlNg][index_db][1]: RemoteTransportException[[elasticsearch_node][10.64.216.92:9375][indices:data/read/search[phase/query]]]; nested: IllegalArgumentException[Fielddata is disabled on text fields by default. Set fielddata=true on [totalEmployee] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.]; }{[q9B7Qs-DSXWC14pjc5zlNg][piyush_db][2]: RemoteTransportException[[elasticsearch_node][10.64.216.92:9375][indices:data/read/search[phase/query]]]; nested: IllegalArgumentException[Fielddata is disabled on text fields by default. Set fielddata=true on [totalEmployee] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.]; }{[q9B7Qs-DSXWC14pjc5zlNg][piyush_db][3]: RemoteTransportException[[elasticsearch_node][10.64.216.92:9375][indices:data/read/search[phase/query]]]; nested: IllegalArgumentException[Fielddata is disabled on text fields by default. Set fielddata=true on [totalEmployee] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.]; }{[q9B7Qs-DSXWC14pjc5zlNg][piyush_db][4]: RemoteTransportException[[elasticsearch_node][10.64.216.92:9375][indices:data/read/search[phase/query]]]; nested: IllegalArgumentException[Fielddata is disabled on text fields by default. Set fielddata=true on [totalEmployee] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.]; }

Answer 1

Finally , I got the answer of my above query. The problem was due to dynamic mapping during indexing in Elasticsearch. Better use your own mapping and do sorting on long type field (In my case I was trying to sort on the basis of keyword (string) field type).

Answer 2

As totalEmployee was analyzed field, elastic requries field data value as true to perform sort operation. Instead you can use totalEmployee.keyword to achieve desired results.

Below is the working code.

QueryBuilder qb = QueryBuilders.matchAllQuery();

SearchResponse response = client.prepareSearch("index_db").setTypes("departments")
                    .addSort(SortBuilders.fieldSort("totalEmployee.keyword")
                    .order(SortOrder.ASC)).setQuery(qb)
                    .setSize(100).execute().actionGet();

for(SearchHit hits : response.getHits())
{
     System.out.print("id = " + hits.getId());
     System.out.println(hits.getSourceAsString());
}