ElasticSearch查詢索引分片副本等信息&字段類型等

1. 查看集羣信息（索引分片，副本數，創建時間等信息）：curl -XGET "http://127.0.0.1:9200/index1-mdl/_settings?pretty"
   1. java實現方式

 public Map<String, String> getIndexSettings(String indexName) {
        Settings stat = EsClient.getInstance().getEsClient()
                .admin()
                .cluster()
                .prepareState()
                .execute()
                .actionGet()
                .getState()
                .getMetaData()
                .getIndices()
                .get(indexName)
                .getSettings();

        return stat.getAsMap();
    }

2. 獲取索引中所有的字段及類型：curl -XGET "http://127.0.0.1:9200/index1-mdl/_mapping?pretty"
   1. java實現方式

	public Map<String, Object> getIndexMappings(String indexName) {
        GetMappingsRequest getMappingsRequest = new GetMappingsRequest();
        getMappingsRequest.indices(indexName).types(new String[0]);

        GetMappingsResponse response = EsClient.getInstance().getEsClient()
                .admin()
                .indices()
                .getMappings(getMappingsRequest)
                .actionGet();

        ImmutableOpenMap<String, ImmutableOpenMap<String, MappingMetaData>> mappings = response.getMappings();
        if (mappings.size() == 1) {
            for (ObjectObjectCursor<String, ImmutableOpenMap<String, MappingMetaData>> indexEntry : mappings) {
                if (indexEntry.value.isEmpty()) {
                    continue;
                }

                for (ObjectObjectCursor<String, MappingMetaData> typeEntry : indexEntry.value) {
//                System.out.println(typeEntry.value.sourceAsMap());
                    Map<String, Object> filedNameAndTypeMap;
                    try {
                        filedNameAndTypeMap = typeEntry.value.sourceAsMap();
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    }

                    return filedNameAndTypeMap;
                }
            }
        }

        return null;
    }