[DOCS] Warn about the caveats with aliasing aliases #10106
Description
Aliases are just tags on indices and not constructs in their own right. At the moment you can create an alias using aliases by doing the following:
curl -XPOST 'localhost:9200/_aliases' -d '{
"actions" : [
{ "add" : { "index" : "2015-01-07", "alias" : "today" } }
{ "add" : { "index" : "2015-01-06", "alias" : "yesterday" } }
{ "add" : { "index" : "2015-01-05", "alias" : "3DaysAgo" } }
{ "add" : { "index" : "2015-01-04", "alias" : "4DaysAgo" } }
{ "add" : { "index" : "2015-01-03", "alias" : "5DaysAgo" } }
{ "add" : { "index" : "2015-01-02", "alias" : "6DaysAgo" } }
{ "add" : { "index" : "2015-01-01", "alias" : "7DaysAgo" } }
]
}'
curl -XPOST 'localhost:9200/_aliases' -d '{
"actions" : [
{ "add" : { "index" : "today", "alias" : "thisWeek" } }
{ "add" : { "index" : "yesterday", "alias" : "thisWeek" } }
{ "add" : { "index" : "3DaysAgo", "alias" : "thisWeek" } }
{ "add" : { "index" : "4DaysAgo", "alias" : "thisWeek" } }
{ "add" : { "index" : "5DaysAgo", "alias" : "thisWeek" } }
{ "add" : { "index" : "6DaysAgo", "alias" : "thisWeek" } }
{ "add" : { "index" : "7DaysAgo", "alias" : "thisWeek" } }
]
}'
This makes it look like thisWeek points to today which points to 2015-01-07. What actually happens is that 2015-01-07 gets two aliases: today and thisWeek. This works absolutely fine but anyone using this method needs to be aware that if they update the today alias to point to 08-01-2015 it will not update the thisWeek alias and they will need to update that alias as well.
Is this something we should add to the documentation?
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