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<a name="EN-US_TOPIC_0000002473954292"></a><a name="EN-US_TOPIC_0000002473954292"></a>
<h1 class="topictitle1">Differences Between Elasticsearch Cluster Versions</h1>
<div id="body0000001820357958">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000002473954292__table16645151217147" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Features of different Elasticsearch cluster versions</caption><thead align="left"><tr id="EN-US_TOPIC_0000002473954292__row1964712121145"><th align="left" class="cellrowborder" valign="top" width="20.47%" id="mcps1.3.1.2.5.1.1"><p id="EN-US_TOPIC_0000002473954292__p5647101212147">Version Feature</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25.45%" id="mcps1.3.1.2.5.1.2"><p id="EN-US_TOPIC_0000002473954292__p1164761215142">5.X Version</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="29.080000000000002%" id="mcps1.3.1.2.5.1.3"><p id="EN-US_TOPIC_0000002473954292__p664761220144">6.X Version</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.1.2.5.1.4"><p id="EN-US_TOPIC_0000002473954292__p364718128149">7.X Version</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000002473954292__row2064718127140"><td class="cellrowborder" valign="top" width="20.47%" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p2647191218143">Supported types</p>
</td>
<td class="cellrowborder" valign="top" width="25.45%" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p564761217145">An index can contain multiple types. The name of each type can be customized.</p>
</td>
<td class="cellrowborder" valign="top" width="29.080000000000002%" headers="mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p13647171261415">An index can contain only one type, and the type name can be customized.</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p16647101281412">An index can contain only one type. The type name and <strong id="EN-US_TOPIC_0000002473954292__b275212345189">_doc</strong> are fixed.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row20647151231410"><td class="cellrowborder" rowspan="2" valign="top" width="20.47%" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p6647181214140">Client access</p>
<p id="EN-US_TOPIC_0000002473954292__p118011112224"></p>
</td>
<td class="cellrowborder" valign="top" width="25.45%" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p7647181213146">TransportClient is supported. TCP and HTTP can be used for connection requests at the same time.</p>
</td>
<td class="cellrowborder" valign="top" width="29.080000000000002%" headers="mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p1164719129144">TransportClient is supported. TCP and HTTP can be used for connection requests at the same time. Java High Level REST Client is recommended.</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p9647161215145">Only RestClient is supported. Only HTTP can be used for connection requests. Java High Level REST Client is recommended.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row11180111115222"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p8125160122111">The following is an example of using TransportClient to access an Elasticsearch cluster:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen18691814202111">//Initialize the client and connect to port 9300.
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300))
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host2"), 9300));
//Close the client.
client.close();</pre>
<p id="EN-US_TOPIC_0000002473954292__p14180171142210"></p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p888963818221">The following is an example of using Java High Level REST Client to access a cluster:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen976105252210">//Initialize the client and connect to port 9200.
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("localhost", 9200, "http"),
new HttpHost("localhost", 9201, "http")));
//Close the client.
client.close();</pre>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row7647141291410"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p364761211143">Template configuration</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p264861261412">The <strong id="EN-US_TOPIC_0000002473954292__b4791113583710">template</strong> field is used to create a template.</p>
<p id="EN-US_TOPIC_0000002473954292__p13153271939">Example:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen151202210414">PUT _template/template_1
{
"template": "te*",
"settings": {
"number_of_shards": 1
}
}</pre>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p6648312161413">The <strong id="EN-US_TOPIC_0000002473954292__b867416455374">index_pattern</strong> field is used to create a template.</p>
<p id="EN-US_TOPIC_0000002473954292__p1128821015412">Example:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen16359461414">PUT _template/template_1
{
"index_patterns": ["te*"],
"settings": {
"number_of_shards": 1
}
}</pre>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row518812019168"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p2018919021613">Boolean type parsing</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p171893061616">In Elasticsearch 5.x, <strong id="EN-US_TOPIC_0000002473954292__b5370193214507">true</strong>, <strong id="EN-US_TOPIC_0000002473954292__b1907634185015">false</strong>, <strong id="EN-US_TOPIC_0000002473954292__b36342375505">on</strong>, <strong id="EN-US_TOPIC_0000002473954292__b20314204010507">off</strong>, <strong id="EN-US_TOPIC_0000002473954292__b1776210424507">yes</strong>, <strong id="EN-US_TOPIC_0000002473954292__b11116184615013">no</strong>, <strong id="EN-US_TOPIC_0000002473954292__b1746619483504">0</strong>, and <strong id="EN-US_TOPIC_0000002473954292__b15227175219509">1</strong> can all be parsed as Boolean values.</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p41893031614">Only <strong id="EN-US_TOPIC_0000002473954292__b136861048135116">true</strong> and <strong id="EN-US_TOPIC_0000002473954292__b12855115510">false</strong> are supported. If other values are used, an error occurs.</p>
<p id="EN-US_TOPIC_0000002473954292__p17358442101019">Only in Elasticsearch 6.<em id="EN-US_TOPIC_0000002473954292__i1693164515211">x</em> or 7.<em id="EN-US_TOPIC_0000002473954292__i18164144813523">x</em>, errors will be reported for the following statements:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen42422692713">GET data1/_search
{
"profile": "noprofile",
"query": {
"match_all": {}
}
}</pre>
<p id="EN-US_TOPIC_0000002473954292__p19189702168"></p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row1636561013166"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p5365111051620">JSON format verification</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p13365151091612">Duplicate keys are allowed in JSON and will be automatically deleted in the background.</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p18365111071620">Duplicate keys are not allowed in JSON. Otherwise, a parsing error is reported.</p>
<p id="EN-US_TOPIC_0000002473954292__p08011582288">Only in Elasticsearch 6.<em id="EN-US_TOPIC_0000002473954292__i866517519815">x</em> or 7.<em id="EN-US_TOPIC_0000002473954292__i1366512512083">x</em>, errors will be reported for the following statements:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen1356282215299">POST data1/doc
{
"isl": 0,
"isl": 1
}</pre>
<p id="EN-US_TOPIC_0000002473954292__p4365181020162"></p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row15730192711161"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p173012751614">DELETE document</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p1373016276169">If <strong id="EN-US_TOPIC_0000002473954292__b4407257699">index1</strong> does not exist and you run the <b><span class="cmdname" id="EN-US_TOPIC_0000002473954292__cmdname19941549115015">DELETE index1/doc/1</span></b> command, the system will create <strong id="EN-US_TOPIC_0000002473954292__b8696132318107">index1</strong>.</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p0587183973917">If you run a command to delete an index that does not exist, an error message is displayed.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row368720322167"><td class="cellrowborder" rowspan="2" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p18687732161616">_alias API validation</p>
<p id="EN-US_TOPIC_0000002473954292__p3442267306"></p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p1781201154413">The <strong id="EN-US_TOPIC_0000002473954292__b8692152633816">index</strong> field in the _alias API can be specified as an alias and can be parsed properly.</p>
<p id="EN-US_TOPIC_0000002473954292__p1386161316294">You can also use an alias to delete an index.</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p5687183221613">The <strong id="EN-US_TOPIC_0000002473954292__b6594171710384">index</strong> field in the _alias API can only be specified as an index name and cannot be an alias.</p>
<p id="EN-US_TOPIC_0000002473954292__p1648720291486">To delete an index, the index name is required.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row13442863305"><td class="cellrowborder" colspan="3" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p543015710314">The following command can run properly in Elasticsearch 5.<em id="EN-US_TOPIC_0000002473954292__i68665164426">x</em>, but an error is reported when you run it in Elasticsearch 6.<em id="EN-US_TOPIC_0000002473954292__i1959194710434">x</em> or 7.<em id="EN-US_TOPIC_0000002473954292__i1786350154313">x</em>.</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen174306783118">PUT log-2023.11.11
POST _aliases
{
"actions": [
{
"add": {
"index": "log-2023.11.11",
"alias": "log"
}
}
]
}
POST _aliases
{
"actions": [
{
"remove": {
"index": "log",
"alias": "log"
}
}
]
}</pre>
<p id="EN-US_TOPIC_0000002473954292__p14294830184617">Error message:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen18506154134717">{
"error" : {
"root_cause" : [
{
"type" : "illegal_argument_exception",
"reason" : "The provided expression [log] matches an alias, specify the corresponding concrete indices instead."
}
],
"type" : "illegal_argument_exception",
"reason" : "The provided expression [log] matches an alias, specify the corresponding concrete indices instead."
},
"status" : 400
}</pre>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row16264174231613"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p32648421163">Default configurations</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p12264144212162">The default number of shards for a new index: 5</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p3264164217160">The default number of shards for a new index: 1</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row1426593316174"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p3265113314179">Default routing</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p7614104115215">In Elasticsearch 5.x/6.x, the following formula is used to calculate the shard where the document should be located:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen88481254122913">shard_num = hash(_routing) % num_of_primary_shards</pre>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p105302025101912">In Elasticsearch 7.x, the following formula is used to calculate the shard where the document should be located:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen192501917193013">routing_factor = num_routing_shards / num_primary_shards
shard_num = (hash(_routing) % num_routing_shards) / routing_factor</pre>
<p id="EN-US_TOPIC_0000002473954292__p418192633013">The following command can be used to specify the value of <strong id="EN-US_TOPIC_0000002473954292__b155641252193">num_routing_shards</strong>:</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen143254883110">index.number_of_routing_shards</pre>
<p id="EN-US_TOPIC_0000002473954292__p0713131103113">If this parameter is not explicitly specified, Elasticsearch automatically calculates the value to split indexes.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row48981144141713"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p6898644111713">Refresh time</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p141061829101917">By default, the refresh operation is performed every second.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p08980445176">If <strong id="EN-US_TOPIC_0000002473954292__b1793614954515">index.refresh_interval</strong> is not explicitly specified and indexes do not receive the <strong id="EN-US_TOPIC_0000002473954292__b761716506462">search</strong> request for long time (the duration is specified by <strong id="EN-US_TOPIC_0000002473954292__b132601317154712">index.search.idle.after</strong> and the value is 30 seconds by default), Elasticsearch does not periodically refresh until when a new search request is received. In this case, search requests are not returned until the next refresh is complete. Therefore, the first search request takes a long time.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row843684919172"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p7834755201717">Parent fuse</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p79692016184614">The parent fuse is triggered when the sum of memory statistics in multiple child fuses exceeds the threshold. The default threshold is 70%.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p13436144911712">The parent fuse is triggered when the heap memory usage exceeds the threshold. The default threshold is 95%.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row559835914172"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p2954884185">Field Data fuse threshold</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p7598125931713">The default value of <strong id="EN-US_TOPIC_0000002473954292__b398520161310">indices.breaker.fielddata.limit</strong> is 60%.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p759835981713">The default value of <strong id="EN-US_TOPIC_0000002473954292__b66151428123118">indices.breaker.fielddata.limit</strong> is 40%.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row07098173184"><td class="cellrowborder" valign="top" width="20.47%" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p1270981720181">The _all field</p>
</td>
<td class="cellrowborder" valign="top" width="25.45%" headers="mcps1.3.1.2.5.1.2 "><p id="EN-US_TOPIC_0000002473954292__p1270917173185">Supported</p>
</td>
<td class="cellrowborder" valign="top" width="29.080000000000002%" headers="mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p57092017131812">Discarded</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p1797214402577">Deleted</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000002473954292__row75042025101820"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p150462510183"><strong id="EN-US_TOPIC_0000002473954292__b6398174115216">hits.total</strong> returned by the search API</p>
</td>
<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p101531144305"><strong id="EN-US_TOPIC_0000002473954292__b9414115512112">hits.total</strong> returned by the search API is a number, indicating the number of hits.</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen1751146849">{
"took": 0,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 1,
}
}</pre>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p19364192112518"><strong id="EN-US_TOPIC_0000002473954292__b117131711102213">hits.total</strong> is not a number.</p>
<pre class="screen" id="EN-US_TOPIC_0000002473954292__screen12636559658">{
"took" : 76,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
"max_score" : 1.0
}
}</pre>
<p id="EN-US_TOPIC_0000002473954292__p69961733193816">In the preceding information:</p>
<p id="EN-US_TOPIC_0000002473954292__p20917124113720"><strong id="EN-US_TOPIC_0000002473954292__b1581414352225">value</strong> indicates the number of matched records.</p>
<p id="EN-US_TOPIC_0000002473954292__p1069494111380"><strong id="EN-US_TOPIC_0000002473954292__b6412174120223">relation</strong> indicates whether the number of hit records in the <strong id="EN-US_TOPIC_0000002473954292__b67398217254">value</strong> parameter is accurate.</p>
<p id="EN-US_TOPIC_0000002473954292__p11598174433815"><strong id="EN-US_TOPIC_0000002473954292__b326975113816">eq</strong> indicates an accurate value.</p>
<p id="EN-US_TOPIC_0000002473954292__p52954247820"><strong id="EN-US_TOPIC_0000002473954292__b106287455227">gte</strong> indicates that the number of hit records is greater than or equal to the <strong id="EN-US_TOPIC_0000002473954292__b3573174292517">value</strong> parameter.</p>
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<tr id="EN-US_TOPIC_0000002473954292__row1139620081915"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.1 "><p id="EN-US_TOPIC_0000002473954292__p939630141918">_cache/clear API</p>
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<td class="cellrowborder" colspan="2" valign="top" headers="mcps1.3.1.2.5.1.2 mcps1.3.1.2.5.1.3 "><p id="EN-US_TOPIC_0000002473954292__p113969014194">The <strong id="EN-US_TOPIC_0000002473954292__b1131712111798">POST</strong> and <strong id="EN-US_TOPIC_0000002473954292__b62412494268">GET</strong> methods are supported.</p>
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<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.5.1.4 "><p id="EN-US_TOPIC_0000002473954292__p839619031915">Only the <strong id="EN-US_TOPIC_0000002473954292__b7256426102618">POST</strong> method is supported.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="css_00_0001.html">Product Overview</a></div>
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