Constant CREATE_ISSUES 

pub const CREATE_ISSUES: &str = "mutation($create0:CreateIssueInput!,$create1:CreateIssueInput!,$create2:CreateIssueInput!,$create3:CreateIssueInput!,$create4:CreateIssueInput!,$create5:CreateIssueInput!,$create6:CreateIssueInput!,$create7:CreateIssueInput!,$create8:CreateIssueInput!,$create9:CreateIssueInput!,$create10:CreateIssueInput!,$send0:Boolean!,$send1:Boolean!,$send2:Boolean!,$send3:Boolean!,$send4:Boolean!,$send5:Boolean!,$send6:Boolean!,$send7:Boolean!,$send8:Boolean!,$send9:Boolean!,$send10:Boolean!){ create0:createIssue(input:$create0) @include(if:$send0){issue{id number url}} create1:createIssue(input:$create1) @include(if:$send1){issue{id number url}} create2:createIssue(input:$create2) @include(if:$send2){issue{id number url}} create3:createIssue(input:$create3) @include(if:$send3){issue{id number url}} create4:createIssue(input:$create4) @include(if:$send4){issue{id number url}} create5:createIssue(input:$create5) @include(if:$send5){issue{id number url}} create6:createIssue(input:$create6) @include(if:$send6){issue{id number url}} create7:createIssue(input:$create7) @include(if:$send7){issue{id number url}} create8:createIssue(input:$create8) @include(if:$send8){issue{id number url}} create9:createIssue(input:$create9) @include(if:$send9){issue{id number url}} create10:createIssue(input:$create10) @include(if:$send10){issue{id number url}}}";

Creates up to MUTATION_BATCH issues in one request, each filed on the board and under its project by the same createIssue — its projectV2Ids and parentIssueId — as CREATE_ISSUE creates one.