If statement is not working for a certain path [log][file][path]

can you please help me understand why this "if" is not working on this
path?

this path comes from filebeat to logstash:
"E:\OUM82\EGGED\TI_DS_FILES\INFASQLS_LOGS\INFASQLS-Extractor-legacy_BI_Repository-28072019.log"

if [log][file][path] =~ "INFASQL" {
                 
	        	   mutate { add_field => { "extractor" => "INFASQLS" }}      
	        	
	        	}

there is no errors at all, any where...

If the mutate does not occur that suggests that the event does not have a [log][file][path] field. What does the event look like on the JSON tab in Kibana/Discover?

as u can see.. , it's exist..

i{
  "_index": "filebeat-2019.07.28",
  "_type": "_doc",
  "_id": "hOFLOWwBWUXxYaxGvl65",
  "_version": 1,
  "_score": null,
  "_source": {
"isReadForAlerting": "0",
"driveLetter": "E:",
"@timestamp": "2019-07-28T15:55:59.941Z",
"fields": {
  "logtype": "log4net"
},
"sourceTimestamp": "2019-07-28 18:55:55",
"threadid": "394",
"customerFolder": "EGGED",
"rootFolder": "OUM82",
"input": {
  "type": "log"
},
"@version": "1",
"loglevel": "INFO",
"message": "2019-07-28 18:55:55,394 INFO - Executing query (263) to: TI.SHD_DB_UI_ETL_DETAILS , ConnectionID: 102, Database: TI_EGGED17_Prod_82, Connection Name: legacy_BI_Repository, Tool Name: INFASQLS_POST_LINEAGE_GSP ",
"ecs": {
  "version": "1.0.0"
},
"sourceMessage": "- Executing query (263) to: TI.SHD_DB_UI_ETL_DETAILS , ConnectionID: 102, Database: TI_EGGED17_Prod_82, Connection Name: legacy_BI_Repository, Tool Name: INFASQLS_POST_LINEAGE_GSP ",
"log": {
  "offset": 5261690,
  "file": {
    "path": "E:\\OUM82\\EGGED\\TI_DS_FILES\\INFASQLS_LOGS\\INFASQLS-Extractor-legacy_BI_Repository-28072019.log"
  }
},
"cloud": {
  "instance": {
    "name": "OctUpload",
    "id": "768097b1-bfb9-4939-b99c-5337aede39ca"
  },
  "machine": {
    "type": "Standard_DS13_v2"
  },
  "provider": "az",
  "region": "westeurope"
},
"host": {
  "architecture": "x86_64",
  "os": {
    "name": "Windows Server 2016 Datacenter",
    "build": "14393.2608",
    "family": "windows",
    "version": "10.0",
    "kernel": "10.0.14393.2608 (rs1_release.181024-1742)",
    "platform": "windows"
  },
  "id": "d79c20df-4184-41a8-b95d-83669c8e3fbe",
  "name": "OctUpload",
  "hostname": "OctUpload"
},
"tags": [
  "beats_input_codec_plain_applied"
],
"agent": {
  "hostname": "OctUpload",
  "id": "83fb6261-5872-4d95-853a-44f2cc41d436",
  "version": "7.0.0",
  "ephemeral_id": "2c8821d5-13f8-442e-958e-5288fb36378d",
  "type": "filebeat"
},
"isParserLog": "FALSE"
  },
  "fields": {
"@timestamp": [
  "2019-07-28T15:55:59.941Z"
]
  },
  "highlight": {
"message": [
  "2019-07-28 18:55:55,394 INFO - Executing query (263) to: TI.SHD_DB_UI_ETL_DETAILS , ConnectionID: 102, Database: TI_EGGED17_Prod_82, Connection Name: legacy_BI_Repository, Tool Name: @kibana-highlighted-field@INFASQLS_POST_LINEAGE_GSP@/kibana-highlighted-field@"
],
"customerFolder.keyword": [
  "@kibana-highlighted-field@EGGED@/kibana-highlighted-field@"
]
  },
  "sort": [
1564329359941
  ]
}

I cannot explain that. If I run with these filters

    mutate { add_field => { "[log][file][path]" => "E:\OUM82\EGGED\TI_DS_FILES\INFASQLS_LOGS\INFASQLS-Extractor-legacy_BI_Repository-28072019.log" } }
    if [log][file][path] =~ "INFASQL" {
        mutate { add_field => { "extractor" => "INFASQLS" }}
    }

then the extractor field does get added.