[[java-admin-indices-put-mapping]]
==== Put Mapping

The PUT mapping API allows you to add a new type while creating an index:

[source,java]
--------------------------------------------------
client.admin().indices().prepareCreate("twitter")   <1>
        .addMapping("tweet", "{\n" +                <2>
                "    \"tweet\": {\n" +
                "      \"properties\": {\n" +
                "        \"message\": {\n" +
                "          \"type\": \"string\"\n" +
                "        }\n" +
                "      }\n" +
                "    }\n" +
                "  }")
        .get();
--------------------------------------------------
<1> <<java-admin-indices-create-index,Creates an index>> called `twitter`
<2> It also adds a `tweet` mapping type.


The PUT mapping API also allows to add a new type to an existing index:

[source,java]
--------------------------------------------------
client.admin().indices().preparePutMapping("twitter")   <1>
        .setType("user")                                <2>
        .setSource("{\n" +                              <3>
                "  \"properties\": {\n" +
                "    \"name\": {\n" +
                "      \"type\": \"string\"\n" +
                "    }\n" +
                "  }\n" +
                "}")
        .get();

// You can also provide the type in the source document
client.admin().indices().preparePutMapping("twitter")
        .setType("user")
        .setSource("{\n" +
                "    \"user\":{\n" +                        <4>
                "        \"properties\": {\n" +
                "            \"name\": {\n" +
                "                \"type\": \"string\"\n" +
                "            }\n" +
                "        }\n" +
                "    }\n" +
                "}")
        .get();
--------------------------------------------------
<1> Puts a mapping on existing index called `twitter`
<2> Adds a `user` mapping type.
<3> This `user` has a predefined type
<4> type can be also provided within the source

You can use the same API to update an existing mapping:

[source,java]
--------------------------------------------------
client.admin().indices().preparePutMapping("twitter")   <1>
        .setType("tweet")                               <2>
        .setSource("{\n" +                              <3>
                "  \"properties\": {\n" +
                "    \"user_name\": {\n" +
                "      \"type\": \"string\"\n" +
                "    }\n" +
                "  }\n" +
                "}")
        .get();
--------------------------------------------------
<1> Puts a mapping on existing index called `twitter`
<2> Updates the `user` mapping type.
<3> This `user` has now a new field `user_name`