Unable to preserve special characters in search results of ElasticSearch

Elastic Stack Elasticsearch
1

Hi,

I want to preserve the special characters like -, /, (, ) in search results.

Ex: Abc/def a(bc)def a-bcd
response: If I enter Abc/ the records containing abc/ need to come, similarly for abc/def records with the following need to come, in the same way abc/def a(bc) records with the similar combination need to come.

For this I have used different analyzers and filters and the settings and mappings as follows:

PUT /facebook?pretty=true
{
"settings" : {
"analysis" : {
"filter" : {
"special_character_spliter" : {
"type" : "word_delimiter",
"preserve_original": "true"
}
},
"analyzer" : {
"my_an" : {
"type" : "pattern",
"pattern" : "[^(/-*\w\p{L}]+",
"tokenizer" : "whitespace",
"filter" : [ "special_character_spliter"]
}
}
}
},
"mappings" : {
"face" : {
"properties" : {
"msg" : {
"type" : "string",
"analyzer": "my_an"

            },
            "name" : {
                "type" : "string"
            }
        }
    }
}

}

and even I have tried with the following settings also:

PUT facebook?pretty=true
{
"settings": {
"index.number_of_replicas": 0,
"analysis": {
"analyzer": {
"msg_excp_analyzer": {
"type": "custom",
"tokenizer": "whitespace",
"filters": ["my_word_delimiter","my_word_pattern",
"lowercase",
"asciifolding",
"shingle",
"standard"]
}
},
"filters": {
"my_word_pattern":
{
"type" : "pattern_capture",
"preserve_original" : 1,
"patterns" : [
"(\w+)",
"(\p{L}+)",
"(\d+)",
"@(.+)"
]

            },
            "my_word_delimiter": {
                "type": "word_delimiter",
                "preserve_original": "true",
                  "catenate_all": "true",
                  "type_table": {
                    "$": "DIGIT",
                    "%": "DIGIT",
                    ".": "DIGIT",
                    ",": "DIGIT",
                    ":": "DIGIT",
                    "/": "DIGIT",
                    "\\": "DIGIT",
                    "=": "DIGIT",
                    "&": "DIGIT",
                    "(": "DIGIT",
                    ")": "DIGIT",
                    "<": "DIGIT",
                    ">": "DIGIT",
                    "\\U+000A": "DIGIT"

            },
            "my_asciifolding": {
                "type": "asciifolding",
                "preserve_original": true
            }
        }
    }
}
},
"mappings": {
    "face": {
        "properties": {
            "msg": {
                "type": "string",
                "index": "analyzed",
                "analyzer": "msg_excp_analyzer"
            },
            "name": {
                "type": "string",
                "index": "analyzed",
                "analyzer": "msg_excp_analyzer"
            }
        }
    }
}

}

With above settings I have tried separately inorder to preserve the special characters in search results,
and i have used query like:

GET facebook/face/_search
{

"query": {
"bool": {
"must": [
{
"query_string": {
"fields": [
"msg"
],
"query": "a/"
}
}
]
}

}

}

Am getting the following error:

"error": "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[trVZmtb4Qu-QWIqxK5hEfg][facebook][0]: SearchParseException[[facebook][0]:

May I know what is the problem with , whether is it with my query or settings?