Search query with java rest client

Elastic Stack Elasticsearch
1

I am using rest client api for search query but in response i am getting exception of invalid character exception. I am looking for examples to check my format but did not find any.
My code is -

    String body = "{" +
    					 "\"query\":"+"\"{"+"\"prefix"+  
    					 "\":\"{"+"\"search\":"+ 
    					 "\"{"+"\"value\"ank"+"\"}"+        		        
    	       		     "\"}"+"\"}"+"\"}";
    		
    		queryBody.append(body);
    		
    		HttpEntity entity = new NStringEntity(queryBody.toString(), ContentType.APPLICATION_JSON);

    		Response restResponse = client.performRequest("GET", "/searchable/_search?pretty-d"+body, Collections.emptyMap());

Exception
illegal character in query at index 28: /searchable/_search?pretty-d{"query":"{"prefix":"{"search":"{"value"ank"}"}"}"}

Help me out I have an emergency!!!!!!

2

Remove ?pretty-d

3

With GET he still needs to pass the JSON query with the source query string parameter

and he has one too many double quote in "value"ank"

4

still i am getting same exception

java.net.URISyntaxException: Illegal character in path at index 19: /searchable/_search{"query":"{"prefix":"{"search":"{"value"ank"}"}"}"}

5

I think i missed the colon ":"

I added but still same exception do i need to remove double quotes too?

Illegal character in query at index 28: /searchable/_search?pretty-d{"query":"{"prefix":"{"search":"{"value":"ank"}"}"}"}

6

Changed my format as

{"query":{"prefix":{"search":{"value":"ank"}}}}

but still same error do i need to change anything else

Caused by: java.net.URISyntaxException: Illegal character in path at index 21: /searchable/_search-d{"query":{"prefix":{"search":{"value":"ank"}}}}