Fix duplicate operation id caused by use of 2 methods GET/POST method…

… from getKeywordById api (#7586)

* Remove POST method from getKeywordById. api
A get method should not generally support a POST?
It caused duplicates duplicate OperationID that would occur (getKeywordById and getKeywordById_1)

* Re added POST method for keyword and depreciated the GET api.

* Use common private getKeyword function for both api calls.

* Revert endpoint back to /keyword for GET

services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java

@@ -327,10 +327,7 @@ public Object searchKeywords(
     )
     @RequestMapping(
         path = "/keyword",
-        method = {
-            RequestMethod.GET,
-            RequestMethod.POST
-        },
+        method = RequestMethod.GET,
         produces = {
             MediaType.APPLICATION_XML_VALUE,
             MediaType.APPLICATION_JSON_VALUE
@@ -382,6 +379,112 @@ public Object getKeywordById(
         @Parameter(hidden = true)
         HttpServletRequest request
         ) throws Exception {
+        return getKeyword(uri,sThesaurusName,langs, keywordOnly, transformation,langMapJson,allRequestParams, accept, request);
+    }
+
+    /**
+     * Gets the keyword by id.
+     *
+     * @param uri              the uri
+     * @param sThesaurusName   the s thesaurus name
+     * @param langs            the langs
+     * @param keywordOnly      the keyword only
+     * @param transformation   the transformation
+     * @param allRequestParams the all request params
+     * @param request          the request
+     * @return the keyword by id
+     * @throws Exception the exception
+     */
+    @io.swagger.v3.oas.annotations.Operation(
+        summary = "Get keyword by ids",
+        description = "Retrieve XML representation of keyword(s) from same thesaurus" +
+            "using different transformations. " +
+            "'to-iso19139-keyword' is the default and return an ISO19139 snippet." +
+            "'to-iso19139-keyword-as-xlink' return an XLinked element. Custom transformation " +
+            "can be create on a per schema basis." +
+            "This can be used instead of the GET method for cases where you need to submit large parameters list"
+    )
+    @RequestMapping(
+        path = "/keyword",
+        method = RequestMethod.POST,
+        produces = {
+            MediaType.APPLICATION_XML_VALUE,
+            MediaType.APPLICATION_JSON_VALUE
+        })
+    @ApiResponses(value = {
+        @ApiResponse(responseCode = "200", description = "XML snippet with requested keywords."),
+    })
+    @ResponseBody
+    @ResponseStatus(HttpStatus.OK)
+    public Object getKeywordByIds(
+        @Parameter(
+            description = "Keyword identifier or list of keyword identifiers comma separated.",
+            required = true)
+        @RequestParam(name = "id")
+            String uri,
+        @Parameter(
+            description = "Thesaurus to look info for the keyword(s).",
+            required = true)
+        @RequestParam(name = "thesaurus")
+            String sThesaurusName,
+        @Parameter(
+            description = "Languages.",
+            required = false)
+        @RequestParam(name = "lang", required = false)
+            String[] langs,
+        @Parameter(
+            description = "Only print the keyword, no thesaurus information.",
+            required = false)
+        @RequestParam(required = false, defaultValue = "false")
+            boolean keywordOnly,
+        @Parameter(
+            description = "XSL template to use (ISO19139 keyword by default, see convert.xsl).",
+            required = false)
+        @RequestParam(required = false)
+            String transformation,
+        @Parameter(
+            description = "langMap, that converts the values in the 'lang' parameter to how they will be actually represented in the record. {'fre':'fra'} or {'fre':'fr'}.  Missing/empty means to convert to iso 2 letter.",
+            required = false)
+        @RequestParam (name = "langMap", required = false)
+            String  langMapJson,
+        @Parameter(hidden = true)
+        @RequestParam
+            Map<String, String> allRequestParams,
+        @RequestHeader(
+            value = "Accept",
+            defaultValue = MediaType.APPLICATION_XML_VALUE
+        )
+        String accept,
+        @Parameter(hidden = true)
+        HttpServletRequest request
+        ) throws Exception {
+        return getKeyword(uri,sThesaurusName,langs, keywordOnly, transformation,langMapJson,allRequestParams, accept, request);
+    }
+
+    /**
+     * Gets the keyword by id.
+     *
+     * @param uri              the uri
+     * @param sThesaurusName   the s thesaurus name
+     * @param langs            the langs
+     * @param keywordOnly      the keyword only
+     * @param transformation   the transformation
+     * @param allRequestParams the all request params
+     * @param request          the request
+     * @return the keyword by id
+     * @throws Exception the exception
+     */
+    private Object getKeyword(
+        String uri,
+        String sThesaurusName,
+        String[] langs,
+        boolean keywordOnly,
+        String transformation,
+        String  langMapJson,
+        Map<String, String> allRequestParams,
+        String accept,
+        HttpServletRequest request
+    ) throws Exception {
         final String SEPARATOR = ",";
         ServiceContext context = ApiUtils.createServiceContext(request);
         boolean isJson = MediaType.APPLICATION_JSON_VALUE.equals(accept);
@@ -458,7 +561,7 @@ public Object getKeywordById(
             }
         }
 
-       Element langConversion = null;
+        Element langConversion = null;
         if ( (langMapJson != null) && (!langMapJson.isEmpty()) ){
             JSONObject obj = JSONObject.fromObject(langMapJson);
             langConversion = new Element("languageConversions");
@@ -512,7 +615,6 @@ public Object getKeywordById(
         }
     }
 
-
     /**
      * Gets the thesaurus.
      *