As Sean said in August 2016, there is (still) no way to change the value of a 
tag.

You can, however, write a client script to do that - see 
https://stackoverflow.com/questions/41990346/change-tag-value-in-influxdb/48075134#48075134

On Monday, August 1, 2016 at 2:42:17 PM UTC-7, Sean Beckett wrote:
> Yes, DROP SERIES or DELETE SERIES will remove the tags from the index as well.
> 
> 
> On Fri, Jul 29, 2016 at 4:43 AM, Ashish Rathore <ashishrat...@gmail.com> 
> wrote:
> 
> 
> If i want to delete old tag values can i use drop series with that particular 
> tag values as it removes it from index too. 
> 
> 
> 
> 
> On Thu, Jul 28, 2016 at 9:11 PM, Sean Beckett <se...@influxdb.com> wrote:
> 
> 
> 
> There is currently no way to rename a tag except to rewrite the data with the 
> new tag value. https://github.com/influxdata/influxdb/issues/4157 is the 
> feature request to enable this, but it is not a priority for the 1.0 release. 
> I hope that it will be part of 1.1 or 1.2. We are also working on some bulk 
> export/import tools so that you could read and rewrite the data in an 
> automated way.
> 
> 
> On Thu, Jul 28, 2016 at 8:22 AM, Ashish Rathore <ashishrat...@gmail.com> 
> wrote:
> 
> 
> Actually previously i was using some another tag value and now its been 
> modified. 
> 
> What should be best strategy to rename/update  tag values  in influxdb.

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