Add field "keyspace_alias" to current index for Advise stmt

"results": [
{
"#operator": "Advise",
"advice": {
"#operator": "IndexAdvice",
"adviseinfo": [
{
"current_indexes": [

{ "index_statement": "CREATE PRIMARY INDEX #primary ON `travel-sample`", "keyspace_alias": "travel-sample" }

],
"recommended_indexes": {
"covering_indexes": [

{ "index_statement": "CREATE INDEX adv_type_id_c1 ON `travel-sample`(`type`,`id`,`c1`)", "keyspace_alias": "travel-sample_t1" }

],
"indexes": [

{ "index_statement": "CREATE INDEX adv_type_id ON `travel-sample`(`type`,`id`)", "keyspace_alias": "travel-sample_t1", "recommending_rule": "Index keys follow order of predicate types: 2. equality/null/missing, 5. less than/between/greater than." }

]
}
}
]
},
"query": "select c1 from `travel-sample` t1 where type =\"route\" and id <10;"
}
]