Constant UPDATE_ISSUES 

pub const UPDATE_ISSUES: &str = "mutation($update0:UpdateIssueInput!,$update1:UpdateIssueInput!,$update2:UpdateIssueInput!,$update3:UpdateIssueInput!,$update4:UpdateIssueInput!,$update5:UpdateIssueInput!,$update6:UpdateIssueInput!,$update7:UpdateIssueInput!,$update8:UpdateIssueInput!,$update9:UpdateIssueInput!,$update10:UpdateIssueInput!,$send0:Boolean!,$send1:Boolean!,$send2:Boolean!,$send3:Boolean!,$send4:Boolean!,$send5:Boolean!,$send6:Boolean!,$send7:Boolean!,$send8:Boolean!,$send9:Boolean!,$send10:Boolean!){ update0:updateIssue(input:$update0) @include(if:$send0){issue{id}} update1:updateIssue(input:$update1) @include(if:$send1){issue{id}} update2:updateIssue(input:$update2) @include(if:$send2){issue{id}} update3:updateIssue(input:$update3) @include(if:$send3){issue{id}} update4:updateIssue(input:$update4) @include(if:$send4){issue{id}} update5:updateIssue(input:$update5) @include(if:$send5){issue{id}} update6:updateIssue(input:$update6) @include(if:$send6){issue{id}} update7:updateIssue(input:$update7) @include(if:$send7){issue{id}} update8:updateIssue(input:$update8) @include(if:$send8){issue{id}} update9:updateIssue(input:$update9) @include(if:$send9){issue{id}} update10:updateIssue(input:$update10) @include(if:$send10){issue{id}}}";

Updates up to MUTATION_BATCH existing issues a copy rewrites, each with the members its own UPDATE_ISSUE would have sent, in one request.