question: get the index of the shard which allocation should be canceled concode_field_sep ParseField COMMAND_NAME_FIELD concode_elem_sep String node concode_elem_sep String NAME concode_elem_sep String index concode_elem_sep int shardId concode_elem_sep boolean allowPrimary concode_field_sep void writeTo concode_elem_sep String node concode_elem_sep XContentBuilder toXContent concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String name concode_elem_sep int shardId concode_elem_sep CancelAllocationCommand fromXContent concode_elem_sep boolean allowPrimary concode_elem_sep RerouteExplanation execute
target: String function ( ) { return this . index ; }