Lucene Query String Elasticsearch "less than or equal to"[URI Search]

You will want to use Query String Syntax (https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html) ranges combined with the URI Search (https://www.elastic.co/guide/en/elasticsearch/reference/current/search-uri-request.html)

Ranges

Ranges can be specified for date, numeric or string fields. Inclusive ranges are specified with square brackets [min TO max] and exclusive ranges with curly brackets {min TO max}.

    All days in 2012:    date:[2012/01/01 TO 2012/12/31]    Numbers 1..5    count:[1 TO 5]    Tags between alpha and omega, excluding alpha and omega:    tag:{alpha TO omega}    Numbers from 10 upwards    count:[10 TO *]    Dates before 2012    date:{* TO 2012/01/01}Curly and square brackets can be combined:    Numbers from 1 up to but not including 5    count:[1..5}Ranges with one side unbounded can use the following syntax:age:>10age:>=10age:<10age:<=10NoteTo combine an upper and lower bound with the simplified syntax, you would need to join two clauses with an AND operator:age:(>=10 AND < 20)age:(+>=10 +<20)The parsing of ranges in query strings can be complex and error prone. It is much more reliable to use an explicit range filter.

URI Search

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A search request can be executed purely using a URI by providing request parameters. Not all search options are exposed when executing a search using this mode, but it can be handy for quick "curl tests". Here is an example:

$ curl -XGET'http://localhost:9200/twitter/tweet/_search?q=user:kimchy'

I think you wanna query the documents with less than equal to 100.

 curl -XPOST "http://hostname:9200/index/try/_search" -d'{ "query": {    "range": {      "FieldName": {         "lte" : 100      }    }  }}'

PHP API client

array('query' => array(    'range' => array(        'FieldName' => array(            array("lte" => 100)        )    )  ));

for more queries.. refer

The query format thet you asked for..!

curl -XPOST "http://hostname:9200/index/type/_search?q=FieldName:[* to 100]"

HOpe it helps..!