@timestamp type change for Kibana3

Hi All,

Iam using logstash+elasticsearch+kibana3 in my local machine, having
trouble to create histograms in Kibana3 with hostname & date wise logcount.

i have gone through some of the articles, found the @timestamp type is
having "date".
i feel if i change to @timestamp type to string, hopefully i may meet my
requirements.

Please suggest how can i update following lines.

http://localhost:9200/_mapping?pretty

"@timestamp" : {
"type" : "date",
"format" : "dateOptionalTime"
},

Want to make it as

"@timestamp" : {
"type" : "string",
},

also, let me know if we have any other way to meet my requirements.

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