How do I do a partial match in Elasticsearch?

The point is that the ElasticSearch regex you are using requires a full string match:

Lucene’s patterns are always anchored. The pattern provided must match the entire string.

Thus, to match any character (but a newline), you can use .* pattern:

match: { text: '.*google.*'}                ^^      ^^

One more variation is for cases when your string can have newlines: match: { text: '(.|\n)*google(.|\n)*'}. This awful (.|\n)* is a must in ElasticSearch because this regex flavor does not allow any [\s\S] workarounds, nor any DOTALL/Singleline flags. "The Lucene regular expression engine is not Perl-compatible but supports a smaller range of operators."

However, if you do not plan to match any complicated patterns and need no word boundary checking, regex search for a mere substring is better performed with a mere wildcard search:

{    "query": {        "wildcard": {            "text": {                "value": "*google*",                "boost": 1.0,                "rewrite": "constant_score"            }        }    }} 

See Wildcard search for more details.

NOTE: The wildcard pattern also needs to match the whole input string, thus

• google* finds all strings starting with google
• *google* finds all strings containing google
• *google finds all strings ending with google

Also, bear in mind the only pair of special characters in wildcard patterns:

?, which matches any single character*, which can match zero or more characters, including an empty one

use wildcard query:

'{"query":{ "wildcard": { "text.keyword" : "*google*" }}}'

For both partial and full text matching ,the following worked

"query" : {    "query_string" : {      "query" : "*searchText*",      "fields" : [        "fieldName"      ]    }