remove space_type in settings (#535)

Signed-off-by: zhichao-aws <[email protected]>

Author: zhichao-aws

src/test/java/org/opensearch/integTest/RAGToolIT.java

@@ -161,7 +161,6 @@ private void prepareIndex() {
             + "  },\n"
             + "  \"settings\": {\n"
             + "    \"index\": {\n"
-            + "      \"knn.space_type\": \"cosinesimil\",\n"
             + "      \"default_pipeline\": \"test-embedding-model\",\n"
             + "      \"knn\": \"true\"\n"
             + "    }\n"

src/test/java/org/opensearch/integTest/VectorDBToolIT.java

@@ -86,7 +86,6 @@ private void prepareIndex() {
             + "  },\n"
             + "  \"settings\": {\n"
             + "    \"index\": {\n"
-            + "      \"knn.space_type\": \"cosinesimil\",\n"
             + "      \"default_pipeline\": \"test-embedding-model\",\n"
             + "      \"knn\": \"true\"\n"
             + "    }\n"
@@ -148,7 +147,6 @@ private void prepareNestedIndex() {
             + "  },\n"
             + "  \"settings\": {\n"
             + "    \"index\": {\n"
-            + "      \"knn.space_type\": \"cosinesimil\",\n"
             + "      \"default_pipeline\": \"test-embedding-model\",\n"
             + "      \"knn\": \"true\"\n"
             + "    }\n"