MSEARCH-333 Optimize query for subject browsing

Approach

Current query to retrieve the subject counts provides results in 4-6 second. It can be optimized using following approaches:

move filters from the aggregation to the query level
Use single msearch request to retrieve subject count without aggregation using basic terms query per each subject

Performance test configuration

Property	Value
Environment	https://falcon-perf-okapi.ci.folio.org
mod-search	3 nodes with CPU limit = 1024m and memoryLimit = 1200MB
okapi	3 nodes with CPU limit = 256m and memoryLimit = 536MB
mod-authtoken	2 nodes with CPU limit = 128m and memoryLimit = 360MB
mod-login	2 nodes with CPU limit = 128m and memoryLimit = 536MB
mod-permissions	2 nodes with CPU limit = 128m and memoryLimit = 536MB
ElasticSearch	AWS based Number of nodes: 4 Resources: r6g.large, 16 GiB of Memory, 2 vCPUs, EBS only, 64-bit Arm platform Properties: timeout=30
Search queries	Terms Expand source washington africa independence media disk comparison computer series system housing trainer airport priority emotion possession topic appointment mixture committee awareness way hospital success addition hearing worker combination effort fortune interaction hospital lady confusion music throat agency science wedding exam honey pizza leadership marketing road initiative audience poem fortune elevator area dirt height breath charity two success engine length quantity suggestion supermarket reputation shopping administration outcome promotion mode profession shirt funeral hair cheek patience independence psychology effort engineering drawer reflection army resource people writing people volume reception scene son pie population combination weakness impression gate worker computer song proposal history fact love contract
Count of resources	8,180,456 (bugwest kiwi dataset)
Count of subjects	4,078,882
Performance Test duration	300 (5 min)
V_USERS	5
RAMP_UP	5 sec
HOSTNAME	falcon-perf-okapi.ci.folio.org

Aggregated Results

Label	# Samples	Average	Min	Max	Std. Dev.	Error %	Throughput	Received KB/sec	Sent KB/sec	Avg. Bytes	Cache Usage, MB
Current solution	667	2239	244	5703	1156.73	0.00%	2.21114	15.41	1.14	7136.2	3.5
Optimized query with terms filter	1791	832	234	6577	511.44	0.00%	5.95179	41.47	3.07	7134.5	6.5
Terms queries	1707	873	245	3780	527.85	0.00%	5.66831	39.5	2.93	7135.1	26.7

Current solution

5_curr_5min_subjectBrowse_20220420.csv

Elasticsearch query:

{
  "from": 0,
  "size": 0,
  "query": {
    "match_all": { "boost": 1.0 }
  },
  "aggregations": {
    "subjects": {
      "terms": {
        "field": "plain_subjects",
        "size": 2,
        "min_doc_count": 1,
        "shard_min_doc_count": 0,
        "show_term_doc_count_error": false,
        "order": [ { "_count": "desc" }, { "_key": "asc" } ],
        "include": [ "s1", "s2" ]
      }
    }
  }
}

Optimized query with terms filter

5_opt1_5min_subjectBrowse_20220420.csv

Elasticsearch query example

{
  "from": 0,
  "size": 0,
  "query": {
    "bool": {
      "filter": [ 
        { "terms": 
          { "plain_subjects": [ "s1", "s2" ], "boost": 1.0 } 
        } 
      ],
      "adjust_pure_negative": true,
      "boost": 1.0
    }
  },
  "aggregations": {
    "subjects": {
      "terms": {
        "field": "plain_subjects",
        "size": 2,
        "min_doc_count": 1,
        "shard_min_doc_count": 0,
        "show_term_doc_count_error": false,
        "order": [ { "_count": "desc" }, { "_key": "asc" } ],
        "include": [ "s1", "s2" ]
      }
    }
  }
}

Term query based counts (msearch)

5_opt2_5min_subjectBrowse_20220420.csv

Elasticsearch multisearch request example

{"index": "folio_instance_folio"}
{"from":0,"size":0,"query":{"term":{"plain_subjects":{"value":"s1","boost":1.0}}},"track_total_hits":true}
{"index": "folio_instance_folio"}
{"from":0,"size":0,"query":{"term":{"plain_subjects":{"value":"s2","boost":1.0}}},"track_total_hits":true}

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