code: @DELETE
      @Path("/guid/{guid}")
      @Consumes(Servlets.JSON_MEDIA_TYPE)
      @Produces(Servlets.JSON_MEDIA_TYPE)
      public void deleteById(@PathParam("guid") String guid) throws AtlasBaseException {
          AtlasPerfTracer perf = null;
  
          try {
              if (AtlasPerfTracer.isPerfTraceEnabled(PERF_LOG)) {
                  perf = AtlasPerfTracer.getPerfTracer(PERF_LOG, "RelationshipREST.deleteById(" + guid + ")");
              }
  
              relationshipStore.deleteById(guid);
          } finally {
              AtlasPerfTracer.log(perf);
          }
      }
docs: Delete a relationship between entities using guid.