Sum of fields between two dates in ElasticSearch - elasticsearch

Question

I'm very new to ElasticSearch
I want to sum of salary between two dates 27/08/2020 and 31/08/2020 which I'm not able to achieve.
I'm posting here the simple query and the outcome of the query.
I read about date-histogram but could not find a specific answer and If the outcome is very simple then why date-histogram is asking to put in interval as well as it returns data in the bucket.
Documents in employees index are
{
"took": 3,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 3,
"relation": "eq"
},
"max_score": 1.0,
"hits": [
{
"_index": "employees",
"_type": "_doc",
"_id": "wO8AMXQBDHla7ClA8iDV",
"_score": 1.0,
"_source": {
"FirstName": "JOYE",
"LastName": "WIATR",
"Designation": "CEO",
"Salary": 144000,
"DateOfJoining": "25/05/2009",
"Address": "9068 SW. Grove St. Waynesboro, PA 17268",
"Gender": "Female",
"Age": 58,
"MaritalStatus": "Unmarried",
"Interests": "Renting movies,Scuba Diving,Snowboarding,Butterfly Watching,Dumpster Diving,Badminton,Church/church activities"
}
},
{
"_index": "employees",
"_type": "_doc",
"_id": "wu8CMXQBDHla7ClAwCDT",
"_score": 1.0,
"_source": {
"FirstName": "Ajay",
"LastName": "Jaiswal",
"Designation": "CEO",
"Salary": 44000,
"DateOfJoining": "28/08/2020",
"Address": "Hyderabad",
"Gender": "Male",
"Age": 29,
"MaritalStatus": "Unmarried",
"Interests": "Watching movies , learing from scratch"
}
},
{
"_index": "employees",
"_type": "_doc",
"_id": "w-8KMXQBDHla7ClAICC9",
"_score": 1.0,
"_source": {
"FirstName": "MR.X",
"LastName": "Jaiswal",
"Designation": "CEO",
"Salary": 56000,
"DateOfJoining": "30/08/2020",
"Address": "Hyderabad",
"Gender": "Male",
"Age": 39,
"MaritalStatus": "Married",
"Interests": "Watching movies,Watching war movies"
}
}
]
}
}
Here is my query
{
"query": {
"bool": {
"must": [
{
"range": {
"DateOfJoining": {
"gte": "27/08/2020",
"lte": "31/08/2020"
}
}
}
]
}
}
}
and here is the outcome of the query
{
"took": 11,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 2,
"relation": "eq"
},
"max_score": 1.0,
"hits": [
{
"_index": "employees",
"_type": "_doc",
"_id": "wu8CMXQBDHla7ClAwCDT",
"_score": 1.0,
"_source": {
"FirstName": "Ajay",
"LastName": "Jaiswal",
"Designation": "CEO",
"Salary": 44000,
"DateOfJoining": "28/08/2020",
"Address": "Hyderabad",
"Gender": "Male",
"Age": 29,
"MaritalStatus": "Unmarried",
"Interests": "Watching movies , learing from scratch"
}
},
{
"_index": "employees",
"_type": "_doc",
"_id": "w-8KMXQBDHla7ClAICC9",
"_score": 1.0,
"_source": {
"FirstName": "MR.X",
"LastName": "Jaiswal",
"Designation": "CEO",
"Salary": 56000,
"DateOfJoining": "30/08/2020",
"Address": "Hyderabad",
"Gender": "Male",
"Age": 39,
"MaritalStatus": "Married",
"Interests": "Watching movies,Watching war movies"
}
}
]
}
}
I'm really not able to achieve

Answer 1

I want to sum of salary between two dates 27/08/2020 and 31/08/2020 which I'm not able to achieve.
Try below query:
{
"size": 0,
"query": {
"range": {
"DateOfJoining": {
"gte": "27/08/2020",
"lte": "31/08/2020"
}
}
},
"aggs": {
"sum_of_salary": {
"sum": {
"field": "Salary"
}
}
}
}
I read about date-histogram but could not find a specific answer and
If the outcome is very simple then why date-histogram is asking to put
in interval as well as it returns data in the bucket.
In Date-histograms data is bucketized based on some time period.
e.g if you want to get sum of salaries paid to employees month over month, then date-histogram will help there.