How to Build array of Requests and Build Fork join to get Gp

Question

I have array of locations Id

locationArr=[40871, 60009, 38149, 40868, 43240, 15299, 53897, 40976, 38151, 23183, 38152, 78579, 23180, 40977, 23176, 39565, 40884, 15298, 38147, 40966, 39669]

this array of locations not fixed difference from part to another I get locationArr by

var locationArr = [];
      if(Array.isArray(this.resultArray)){
       this.resultArray.forEach(e=>{
         locationArr.push(e['Loc']);
       })
     }

I need to pass all locationId to service to get GPS1 latitude and longtude for every locationId on array locationArr.

service get location by locationId for only one locationId

getLocationData(id: number) {
console.log("server "+id)
return this.http.get('http://192.168.7.45:9200/location/_doc/'+id);
}


this.partDetailsService.getLocationData(this.LocationId).subscribe(res => {
         this.dataLocation = res['_source']['GPS1'];
         var loc = this.dataLocation.split(',');
         this.lat = loc[0].trim();
         this.lng = loc[1].trim();

How to build array of requests and make fork join to get latitude and longtude for more locationId ? 

to summarize i need to pass 

locationArr to 

http://192.168.7.45:9200/location/_doc/

http://192.168.7.45:9200/location/_doc/ locationArr