Improve search result based on field boost in elasticsearch - vb.net

Question

I am using ElasticSearch 1.7 first time and I have setup weight based on fields. It might change as per requirement. I am getting result from my query but issue is that if I change field weight dramatically then I can't see that much effect on records. Please check my below query and let me know if I am doing anything wrong.
ElasticSearch Query :
{
"from": 0,
"size": 10,
"highlight": {
"pre_tags": [
"<b>"
],
"post_tags": [
"</b>"
],
"fields": {
"title": {},
"description": {}
}
},
"query": {
"function_score": {
"query": {
"query_string": {
"query": "any keyword",
"fields": [
"fullText",
"title^100",
"authors^4",
"pubYear^4",
"publisher^4",
"abstract^2",
"documentTypeName^2",
"topic^6",
"topicSynonym^6"
"quality_value^6",
"domain^2"
],
"default_operator": "AND",
"analyze_wildcard": true
}
},
"score_mode": "sum",
"boost_mode": "sum",
"max_boost": 100
}
}
}
Sample Data:
{
"took": 44,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1465,
"max_score": 14.961364,
"hits": [
{
"_index": "snData",
"_type": "report",
"_id": "159",
"_score": 14.961364,
"_source": {
"str_ID": "159",
"topic": [
"strategy",
"Consumer-targeted strategy"
],
"topicSynonym": [
"assistance",
"coping",
"coping strategies",
"encouragement",
"support"
],
"fullText": "Background: As the incidence and prevalence of prostate cancer continue to rise, the number of men needing help and support to assist them in coping with disease and treatment-related symptoms and their psychosocial effects is likely to increase.",
"quality_value": 1,
"ID": 24034,
"title": "Psychosocial interventions for men with prostate cancer",
"authors": "Parahoo K E Noyes",
"pubYear": "2013",
"publisher": "",
"abstractEN": "Background: As the incidence and prevalence of prostate cancer continue to rise, the number of men needing help and support to assist them in coping with disease and treatment-related symptoms and their psychosocial effects is likely to increase.",
"uniqueID": "",
"documentTypeName": "Review of effects",
"viewCount": 28,
},
"highlight": {
"title": [
"Interventions for men with prostate <b>cancer</b>"
],
"abstract": [
"Background: As the incidence and prevalence of prostate <b>cancer</b> continue to rise, the number of men"
]
}
}
]
}
}
Use Case : If I change weight of quality_value or of anyone else then it should change result based on field weight. I am not sure whether my query is correct or I am missing anything. I am using ElasticSearch 1.7.