I am not 100% sure what you would like to achieve, it helps if you also would have shared the mapping.
A bucket aggregation is about defining the buckets/groups. As you do in your example, you can wrap/nest bucket aggregations to further break down your buckets into sub-buckets and so on.
By default Elasticsearch always calculates the count-metric, but you can specify other metrics to get calculated as well. A metric is calculated per bucket / for a bucket (and not for another metric) this is why you cannot nest a metrics aggregation under a metric aggregation, it simply does not make sense.
Depending how your data looks like the only change you may need to do is, moving the sum_done aggregation out of the aggs-clause, to the same level as your max_date_aggs-aggregation.
Code Snippet
"aggs": {
"max_date_aggs": { "max": {"field": "timestamp"} },
"sum_done": { "sum": { "field": "itemNumberDone"} }
}
After you refined your question and you provided I managed to come up with a solution requiring one single request. As previously mentioned that sum-metric aggregation needs to operate on a bucket and not a metric. The solution is pretty straight forward: rather than calculating the max-date, just re-formulate this aggregation to a terms-aggregation, sorted by descending timestamp, asking for exactly one bucket.
Solution
GET gos_element/_search
{
"size": 0,
"aggs": {
"sender_comp_aggs": {
"terms": {"field": "senderComponent.keyword"},
"aggs": {
"activity_mnemo_aggs": {
"terms": {"field": "activityMnemo.keyword"},
"aggs": {
"activity_instance_id_aggs": {
"terms": {"field": "activityInstanceId.keyword"},
"aggs": {
"business_date_aggs": {
"terms": {"field": "correlationIdSet.businessDate"},
"aggs": {
"context_set_id_closing_aggs": {
"terms": {"field": "contextSetId.closing.keyword"},
"aggs": {
"max_date_bucket_aggs": {
"terms": {
"field": "timestamp",
"size": 1,
"order": {"_key": "desc"}
},
"aggs": {
"sum_done": {
"sum": {"field": "itemNumberDone"}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
As I relied on the default Elasticsearch mapping, I had to refer to the .keyword-version of the fields. If your fields are directly mapped to a field of type keyword, you don't need to do that.
You can test the request above right away after indexing the documents provided by you with the following 2 commands:
PUT gos_element/_doc/AW_yu3dIa2R_HwqpSz
{
"senderComponent": "PS",
"timestamp": "2020-01-28T02:31:00Z",
"activityMnemo": "PScommand",
"activityInstanceId": "123466",
"activityStatus": "Progress",
"activityStatusNumber": 300,
"specificActivityStatus": "",
"itemNumberTotal": 10,
"itemNumberDone": 9,
"itemNumberInError": 0,
"itemNumberNotStarted": 1,
"itemNumberInProgress": 0,
"itemUnit": "Command",
"itemList": [],
"contextSetId": {
"PV": "VAR",
"closing": "PARIS"
},
"correlationIdSet": {
"closing": "PARIS",
"businessDate": "2020-01-27",
"correlationId": "54947df8-0e9e-4471-a2f9-9af509fb5899"
},
"errorSet": [],
"kpiSet": "",
"activitySpecificPayload": "",
"messageGroupUUID": "54947df8-0e9e-4471-a2f9-9af509fb5899"
}
PUT gos_element/_doc/AW_yu3dIa2R_HwqpSz8z
{
"senderComponent": "PS",
"timestamp": "2020-01-28T03:01:00Z",
"activityMnemo": "PScommand",
"activityInstanceId": "123466",
"activityStatus": "End",
"activityStatusNumber": 200,
"specificActivityStatus": "",
"itemNumberTotal": 10,
"itemNumberDone": 10,
"itemNumberInError": 0,
"itemNumberNotStarted": 0,
"itemNumberInProgress": 0,
"itemUnit": "Command",
"itemList": [],
"contextSetId": {
"PV": "VAR",
"closing": "PARIS"
},
"correlationIdSet": {
"closing": "PARIS",
"businessDate": "2020-01-27",
"correlationId": "54947df8-0e9e-4471-a2f9-9af509fb5899"
},
"errorSet": [],
"errorMessages": "",
"kpiSet": "",
"activitySpecificPayload": "",
"messageGroupUUID": "54947df8-0e9e-4471-a2f9-9af509fb5899"
}
As a result you get back the following response (with value 10 as expected):
{
"took" : 8,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
},
"aggregations" : {
"sender_comp_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "PS",
"doc_count" : 2,
"activity_mnemo_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "PScommand",
"doc_count" : 2,
"activity_instance_id_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "123466",
"doc_count" : 2,
"business_date_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : 1580083200000,
"key_as_string" : "2020-01-27T00:00:00.000Z",
"doc_count" : 2,
"context_set_id_closing_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "PARIS",
"doc_count" : 2,
"max_date_bucket_aggs" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 1,
"buckets" : [
{
"key" : 1580180460000,
"key_as_string" : "2020-01-28T03:01:00.000Z",
"doc_count" : 1,
"sum_done" : {
"value" : 10.0
}
}
]
}
}
]
}
}
]
}
}
]
}
}
]
}
}
]
}
}
}
