Elasticsearch slow search query - php

Question

Elasticsearch is taking long time to return records. I have total around 40000 records in the index. Previously I was using Mysql db which was taking around 30 seconds to return data then I moved to Elasticsearch for improving the search experience but Elasticssearch is also taking around 25 seconds.
here is my query
{
"query": {
"bool": {
"must": {
"match": {
"from_name_field_subject_content": "ups"
}
},
"should": [
{
"match": {
"from_name": "ups"
}
}
],
"boost": 1
}
},
"from": 0,
"size": 100
}
mapping
{
"mapping": {
"properties": {
"bcc_field": {
"type": "text"
},
"cc_field": {
"type": "text"
},
"con_us_id": {
"type": "long"
},
"created_by": {
"type": "long"
},
"created_by_group": {
"type": "long"
},
"created_on": {
"type": "date"
},
"ema_con_log_id": {
"type": "long"
},
"ema_rea_by_id": {
"type": "long"
},
"ema_ref_num_id": {
"type": "long"
},
"email_imap_unique_id": {
"type": "long"
},
"email_opened": {
"type": "keyword"
},
"email_opened_date": {
"type": "date"
},
"forward_from_email_id": {
"type": "keyword"
},
"from_field": {
"type": "text",
"copy_to": [
"from_name_field_subject_content"
]
},
"from_name": {
"type": "text",
"copy_to": [
"from_name_field_subject_content"
]
},
"from_name_field_subject_content": {
"type": "text"
},
"full_content": {
"type": "text",
"copy_to": [
"from_name_field_subject_content"
]
},
"in_reply_to": {
"type": "long"
},
"is_active": {
"type": "keyword"
},
"is_archived": {
"type": "keyword"
},
"is_delete": {
"type": "keyword"
},
"is_draft": {
"type": "keyword"
},
"is_flagged": {
"type": "keyword"
},
"is_invoice": {
"type": "keyword"
},
"is_junk": {
"type": "keyword"
},
"is_read": {
"type": "keyword"
},
"is_spam": {
"type": "keyword"
},
"recent_content": {
"type": "text"
},
"subject_field": {
"type": "text",
"copy_to": [
"from_name_field_subject_content"
]
},
"to_field": {
"type": "text"
},
"updated_on": {
"type": "date"
}
}
}
}
full_content is the field which contain a long text data (whole email content with html init)