在Elassandra中创建映射时出错

Question

我正在测试Elassandra，在现有的Cassandra表和Elasticsearch之间创建映射时遇到了一些问题。

根据文档，我使用了这个PUT请求：

PUT to http://localhost:9200/my_index/_mapping/my_table:

{
    "my_table" : {
        "discover" : ".*",
        "properties" : {
            "deviceid" : {
                "type" : "text",
            "timestamp": {
                "type": "date"
            }
        }
    }
}

不幸的是，我得到了这个错误，我不确定为什么：

{
    "error": {
        "root_cause": [
            {
                "type": "mapper_parsing_exception",
                "reason": "Failed to execute query:null : Existing column [timestamp] type [timestamp] mismatch with inferred type [timestamp]"
            }
        ],
        "type": "mapper_parsing_exception",
        "reason": "Failed to execute query:null : Existing column [timestamp] type [timestamp] mismatch with inferred type [timestamp]",
        "caused_by": {
            "type": "configuration_exception",
            "reason": "Existing column [timestamp] type [timestamp] mismatch with inferred type [timestamp]"
        }
    },
    "status": 400
}

Cassandra表肯定包含一个数据类型为timestamp的列。在这里您可以看到desc my_keyspace的摘录

CREATE TABLE my_keyspace.my_table (
    deviceid text,
    timestamp timestamp,
    other_column text,
    PRIMARY KEY ((deviceid, other_column), timestamp)
) WITH CLUSTERING ORDER BY (timestamp DESC)
    AND bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'class': 
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 
'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 
'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';

谁能给我一些关于Elassandra的帮助，并解释为什么会发生这个错误？提前谢谢。