Multi-Index Operations and Aliases

Entire cluster search:

curl 'localhost:9200/_search?q=id:1'

Multiple indices search:

curl 'localhost:9200/index1,index2/_search?q=id:1'

Wildcard search:

curl 'localhost:9200/index*/_search?q=id:*'

Index alias - create an alias for index or for group of indexes:

curl -XPOST 'http://localhost:9200/_aliases' -d '
{
    "actions" : [
        { "add" : { "index" : "test1", "alias" : "alias1" } },
        { "add" : { "index" : "test2", "alias" : "alias1" } }
    ]
}'

Why bother? Logical data partitioning, archiving by index, access control...