[NO ISSUE] Polish exception message

Polish the exception message when creating inverted index with a
variable-length primary key which is not support yet.

Change-Id: I95b6a0088ca4934a6ac4e0fc84d3f8c0b264a56a
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/7583
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ian Maxon <imaxon@uci.edu>
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
index 1c9bfb3..78a82d6 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/translator/QueryTranslator.java
@@ -1097,8 +1097,8 @@
                     // If it is not a fixed length
                     if (!typeTrait.isFixedLength()) {
                         throw new CompilationException(ErrorCode.COMPILATION_ERROR, sourceLoc,
-                                "The keyword or ngram index -" + indexName + " cannot be created on the dataset -"
-                                        + datasetName + " due to its variable-length primary key field - "
+                                "The keyword or ngram index " + indexName + " cannot be created on the dataset "
+                                        + datasetName + " due to its variable-length primary key field "
                                         + partitioningKey);
                     }
 
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
index 58af775..1495ce0 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
@@ -3970,7 +3970,7 @@
     <test-case FilePath="ddl/create-index">
       <compilation-unit name="create-inverted-index-with-variable-length-primary-key">
         <output-dir compare="Text">create-inverted-index-with-variable-length-primary-key</output-dir>
-        <expected-error>ASX1079: Compilation error: The keyword or ngram index -MyIndex cannot be created on the dataset -MyDataset due to its variable-length primary key field - [myKey] (in line 33, at column 1)</expected-error>
+        <expected-error>ASX1079: Compilation error: The keyword or ngram index MyIndex cannot be created on the dataset MyDataset due to its variable-length primary key field [myKey] (in line 33, at column 1)</expected-error>
       </compilation-unit>
     </test-case>
     <test-case FilePath="ddl">